In stock
Grouped product items
Product Name Price Qty
#5 Tapered Bit/Countersink
#5 Tapered Bit/Countersink Item #: 59933
Oversold Until 10/26/2018
#6 Tapered Bit/Countersink
#6 Tapered Bit/Countersink Item #: 59940
In stock
#8 Tapered Bit/Countersink
#8 Tapered Bit/Countersink Item #: 59947
In stock
#10 Tapered Bit/Countersink
#10 Tapered Bit/Countersink Item #: 59955
In stock
#12 Tapered Bit/Countersink
#12 Tapered Bit/Countersink Item #: 59963
In stock

Rockler/Insty-Drive Tapered Drill Bits and Countersinks

Item #
74% of 100

Tapered drill bits and countersinks are made of high-quality high speed steel (HSS). Both tapered bits and countersinks are removable and adjustable. Hex collars and hex shanks fit our Rockler exclusive Insty-Driver.

(1) Rockler/Insty-Drive Tapered Drill Bit and Countersink
More Information
Brand Insty-Bit
Manufacturer Part Number No
Weight 0.1200
Tech Spec No
Tech Docs No
Bit Material High Speed Steel
Bit Size #10, #12, #5, #6, #8
Prop 65 WarningWARNING: Cancer & Reproductive Harm -

Prop 65 WarningWARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to
3.7 / 5.0
43 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I enjoy how the tool works smoothly and very clean drilling.
The hole and countersink were perfect. I have not had a tool like this prior and am very happy with it!
August 6, 2018
2 months ago
Woodworking Experience:
Tool Caddy
Used this to complete a tool caddy attached to my new workbench. This a finished look.
May 20, 2018
4 months ago
Woodworking Experience:
Adding to my set of three
I already have the three sizes that are larger than this and wanted to get the next smallest size. I use these Insty bits all of the time.
March 23, 2018
Woodworking Experience:
Deck looks great
We use this tool when replacing boards on our wood deck, and misplaced it during our last project. Gave this to my Honey-Do with other items for XMas so we are ready when our next project comes up.
January 2, 2018
9 months ago
Woodworking Experience:
Counter sink bit
I was working with a very hard wood and burning two brand name counter sink bits a day. I tried the higher end Rockler counter sink bit and replacement bit and I have replaced the drill bit and still working with the original counter sink. Well worth the extra few $$. 80 feet of 250 feet of a hardwood fence to go.
September 27, 2017
Woodworking Experience:
I love this countersink bit with taper dill bit works great
August 23, 2017
1 year ago
great tool for embedding screw and nail heads
easy to use, makes the job a pleasure
April 25, 2017
1 year ago
Woodworking Experience:
Easy to use
Perfect, clean drilling for #8 wood screws. Set the depth and you're good to go.
March 5, 2017
1 year ago
Woodworking Experience:
Best results
My first time using a tapered bit, excellent results.
February 16, 2017
1 year ago
Woodworking Experience:
I have used these bits on several projects and had great results.
November 2, 2016
1 year ago
Woodworking Experience:
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Browse 9 questions Browse 9 questions and 65 answers
Why did you choose this?
Rockler Store
bigger than box stores
Delvin B on Aug 3, 2018
Use these bits all the time, work well with wood screws in hardwoods.
Jerry C on Jul 5, 2018
bigger than box stores
Delvin B on Aug 3, 2018
I have had a #8 insty bit drills for some time and wanted the smaller #6 drill countersink.
Dale A on Jul 23, 2018
Use these bits all the time, work well with wood screws in hardwoods.
Jerry C on Jul 5, 2018
Like very much , easy to use
Michael M on Jun 24, 2018
Part will allow for individual pieces to be replaced.
Larry E on May 1, 2018
Need to drive #12 screws
Danny C on Mar 19, 2018
Added #5 and #12 to my collection of Insty tapered bits
Dale P on Dec 27, 2017
works great and saves a lot of time. Lots our last one in the grass or under the deck during replacement.
I have used these bits before and they are great for cabinet work
Gaylon C on Nov 5, 2017
To replace an old, dull countersink and bit.
Mark D on Oct 2, 2017
Ordered this replacement after my original gave up the ghost after AT LEAST 10 years of service
Curt S on Sep 20, 2017
1939 Chris Craft Restoration
Dana A on Sep 17, 2017
This is part of a great set. So good, we purchased a set to use at our community theater!
John D on Sep 11, 2017
I really like the convenience of the system and want to have back up
SIDNEY L on Sep 5, 2017
I do not have a #5 in my set.
Richard A on Jun 20, 2017
Have a couple others, needed this one.
Woody on Apr 18, 2017
Needed a countersink, liked the way this quickly changes depth. Excellent drive into the wood.
tom y on Mar 12, 2017
Replacement for broken bit.
John W on Feb 27, 2017
For assembly when using plugs building furniture
Tim Z on Feb 20, 2017
As a cabinetmaker for profit, my screws must go in smoothly. This combo has proven itself. The bits do break so spares are good to have.
Jeff J on Feb 4, 2017
To replace an existing countersink.
Greg S on Jan 26, 2017
Wanted to try it.
Wayne M on Jan 16, 2017
Wanted to complete the set for different size.
Nick S on Jan 13, 2017
I've used Rockler/Insty-Drive tapered drill bits for over 20 years in the Industrial Arts program I teach and I've never found anything better. If/when the tapered bits break (as they often do with student use) I can replace them with a standard twist drill and just keep going! To clarify, we only use these for drilling the clearance hole and countersinking/counterboring.
Craig Wiley C on Jan 2, 2017
Easier to order via rockler then other site.
Pete N on Nov 18, 2016
Thought they would be better than my old units which mount on the drill bit but instead the bevel portion mounts on the drill bit and has the possibility to turn in hard woods. The body should be one unit and the bit adjusts in and out
Rich J on Sep 25, 2016
Trying something new
Brad J on Sep 11, 2016
tried it and love it.
Mark L on Aug 8, 2016
required for a specific project
Gerry G on Aug 1, 2016
ive been trying to find one that works, this one does not work as good as the ones i have. I dont like the tapered bits
Edward L on Jul 18, 2016
A replacement for one that I am currently using. I always keep a spare on hand for when one breaks or wears out.
Dennis on Jul 17, 2016
I love these
John F on May 25, 2016
Saw it in DYS magazine. Fits my need!
Alexander J. M on May 12, 2016
replace a bent countersink holder
Cecil G on Apr 27, 2016
Drill bit tip broke off. Also the part that attaches in drill sees to round off after a while. Still an excellent tool.
Steve K on Mar 19, 2016
New project is a cutoff sled. I want to counter-sink screws.
Kevin S on Mar 2, 2016
I could't fasten cabinet frames together without them.
Gary S on Jan 31, 2016
Old bit worn out and broken
A C on Jan 26, 2016
I wore the first one out.
Joe R on Jan 1, 2016
Xmas list item!
Julia M on Dec 18, 2015
adding to snappy collection of small tools.
Michael M on Dec 8, 2015
Awesome tool, I use it a lot and break em every 5 or so years so this is a spare.
Jennifer H on Nov 26, 2015
Broken bit replacement
Steven T on Nov 18, 2015
Good price. Didn't come up to expectations.
Anthony W on Nov 15, 2015
Replace one I have been using
Leighton D on Sep 26, 2015
Replacement of original I've used for 6 years ... finally hit a screw head and tore the blades off ..
Jack B on Sep 13, 2015
The reason would seem obvious
Mark J on Aug 20, 2015
I use a lot of screws in woodworking and these make a good pilot hole and countersink.
Richard M on Aug 2, 2015
replacement for a well used one of many years.
Melinda O on Jul 7, 2015
Purchased set a week ago. Saw the individual bits on sale and purchased due to reviews I read re: set screws not holding and also smaller bit breakage. Extras will be used when bits in set fail.
RICHARD N on Jul 5, 2015
I have had a #8 insty bit drills for some time and wanted the smaller #6 drill countersink.
Dale A on Jul 23, 2018
Like very much , easy to use
Michael M on Jun 24, 2018
Are the bit size #'s the same as screw size?
A shopper on Jul 5, 2015
What size countersink holes do these bits make? I want to make sure I buy the correct size plug cutter.
sdnalloh on Aug 6, 2015
BEST ANSWER: The # refers to the screw size. We have #5, #6, #8, #10 and #12
What is the counter bore diameter for plugs 1/2 or 3/8?
Paul G on Apr 22, 2016
BEST ANSWER: I miked my #5, #6, #8, and #10 Insty-Drive Countersink bits to verify countersink diameter; they all measure 3/8".
Is this drill & countersink suitable for aluminum?
James D on Jun 2, 2016
BEST ANSWER: Probably, never tried it. Would definitely dull sooner than with wood.
I have a large bag of 3/8th tapered plugs I was given. What size countersink will I need to use these 3/8th plugs?
Chris R on Nov 4, 2015
BEST ANSWER: You would use the 3/8 countersink. Since you have "tapered" plugs you will need to make sure the holes are deep enough to make the plugs fit tighjtly. You migh consider buying a set of counter sinks to give you an assortment of countger sink options.
What do # indicate speaking "metric"? - Screw size #5, e.g. doesn't ring a bell for me (I'm from Europe.).
Johannes on Aug 27, 2017
BEST ANSWER: Drill bit is 1/8 inch .... counter sink is 3/8 inch ... perfect for wooden plugs over screw head. Hope this helps..Jack
What is the counter bore diameter of #8 tapered bit/ countersink #59947?
Mark H on Feb 1, 2017
BEST ANSWER: The #8 tapered drill bit I have has a shank diameter of 11/64" The counter sink diameter is 3/8 ". If you are using this with the intent of plugging your counter sunk holws you will need a 3/8 " plug cutter, Enjoy
I have 1/2 inch plugs is there a drill bit that will dril both screw and plug holes ?
rick F on Jun 3, 2018