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Rockler Bench Dog® Bullnose Trim Gauge

Great for installing three piece crown and base molding on walls with rounded corners.
Item #
98% of 100

Simplify trim work on 3/4" rounded drywall corners with this clever jig. It helps layout perfect lines for tight-fitting three-piece corners. Plus, if you're working alone you can nail it in place to anchor your tape measure. Great for installing both crown and base molding. Durable hard plastic construction will hold up to years of use.

(1) Bench Dog® Bullnose Trim Gauge
(1) Set of instructions
More Information
Brand Bench Dog
Manufacturer Part Number 10-030
Weight 0.2500
Type Trim Molding
4.9 / 5.0
87 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bullnose tool
Awesome tool. Makes the job faster and much more accurate. Recommend purchase 2 for the end of walls and walls bullnosed at each end. Great tool
March 25, 2020
1 month ago
Woodworking Experience:
Bullnose Trim Guage
Thanks for a great product.
Simple, Accurate and easy to use.
I wish all tools had these qualities.

Keep up the good work and great products!

March 3, 2020
1 month ago
Work saver. Extremely accurate.
February 23, 2020
2 months ago
Works great
Simple but works great. Makes mitering crown or base around a bull nosed corner a snap
December 25, 2019
10 months ago
Woodworking Experience:
This works great!
November 1, 2019
6 months ago
Woodworking Experience:
Awesome tool!
This made bullnose corners so easy. I was a little intimidated at first because I've never done baseboards before and every outside corner in my house is bullnose. I highly recommend this little tool.
User submitted image
User submitted image
September 16, 2019
8 months ago
Woodworking Experience:
Money Well Spent
Saves time, significantly eliminates board waste, and the results are extraordinary!
August 25, 2019
7 months ago
Woodworking Experience:
Skirting board corner guide
Nice piece of kit, makes life easy when fitting bullnose corners
August 1, 2019
8 months ago
Woodworking Experience:
Bullnose Trlm Gauge
So glad I was looking through Rockler catalog an Found this Gauge . With out it what a pain it would have been to trim all my base in the house .
July 25, 2019
1 year ago
Woodworking Experience:
Makes baseboards a breeze!
June 29, 2019
9 months ago
Woodworking Experience:
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Browse 6 questions Browse 6 questions and 64 answers
Why did you choose this?
Rockler Store
I have the need for one
Ron on Mar 22, 2020
Improves accuracy of baseboard trim installation or repair on rounded corners.
Alan H on Mar 18, 2020
I have the need for one
Ron on Mar 22, 2020
Seems like it would make it easier.
Alexander L on Mar 20, 2020
Improves accuracy of baseboard trim installation or repair on rounded corners.
Alan H on Mar 18, 2020
Need one to be able to properly trim corners in home
Dennis G on Jan 29, 2020
I picked these items because makes work easier and faster and correct cuts
Mario M on Jan 29, 2020
hope it fits my need
John S on Jan 28, 2020
simple way to do miters
starla l on Jan 18, 2020
I made a few bull nose joints without this jig. There has to be a better way. All these reviews can't be wrong.
Bill J on Jan 17, 2020
Putting in new baseboard trim with rounded corners, this should help with the measuring and cuts.
KOLIN SPERLE S on Jan 14, 2020
I am installing new baseboard on walls that have rounded bullnose corners. This will make trimming those corners so much faster. I wish I had one of these earlier.
Ed S on Jan 8, 2020
Not certain I will ever get around to putting in crown molding but I have alot of round molding at the corners of my plaster walls.
ivan s on Jan 3, 2020
for the rounded corner.
Glenn F on Dec 5, 2019
First time
Richard S on Oct 7, 2019
House full of baseboard work to do
Daniel S on Sep 22, 2019
doing a lot of baseboard work
Michael C on Sep 18, 2019
Installing baseboards in new home
KIRK B on Aug 30, 2019
Installing new baseboards in my home and need this device to increase the accuracy of my cuts.
Casey H on Aug 3, 2019
Upcoming project to replace baseboards and crown moulding
Patrick W on Jul 31, 2019
Ease of creating bullnose molding.
Douglas S on Jul 14, 2019
Recommended by YouTube Channel - Finish Carpentry TV
J.R. N on Jul 5, 2019
Haven't seen one before
Mark J on Jun 19, 2019
For my personnel use for bullnose trim
Veil S on May 29, 2019
This trim gauge will speed up base and crown installations.
Mario G on May 26, 2019
I'm constantly doing bullnose miters should make it easier.
Brian Broadstock R on May 22, 2019
This is a lot more convenient than the home-made jig I made for these corners....<br />(Great idea)
Jeffrey M on May 19, 2019
to finish off some remodel work in my home
Michael J on May 19, 2019
Putting in new baseboards
Randy T on May 16, 2019
Must have tool for finish work.
Danny P on May 13, 2019
Will be starting a crown mldg and base board job with rounded corners.
Roy G on May 5, 2019
I chose this, because I saw it used on a You Tube. I'm a trim carpenter and it looks like it belongs in my tool box.
Scott C on May 4, 2019
I saw it on the intrenets my face tube!!!!
Andrew S on Apr 30, 2019
For work.
Scott Custer S on Apr 27, 2019
New Construction with rounded edges
Lisa S on Apr 21, 2019
Michael D on Apr 5, 2019
These tools will make finishing my family room a breeze.
Marvin B on Apr 2, 2019
This jig looked like the best way to get consistent cuts for installation of baseboards on the rounded corners of my walls that need a bullnose.
Johnny T on Apr 1, 2019
handy... saves steps... more accurate
Rob C on Mar 26, 2019
I'm hoping it will save time which is money at work
Coondog on Mar 23, 2019
I saw this on YouTube and it looks good. The reviews were terrific! Hoping t works as well as everyone says.
Tia W on Mar 17, 2019
I saw on you tube and I liked it
Jose d on Mar 8, 2019
make job more accurate and quicker
Chad C on Feb 12, 2019
Installing base trim around a bull nose corner
Joe on Feb 11, 2019
Seems like a time saver when installing baseboard with 3 pieces corners.
Alan Miranda O on Feb 11, 2019
Heard a lot of good reviews
Chris L on Feb 4, 2019
I tried to buy the precut round wood corners for my stained baseboard but the stain shop couldn't match the color of stain on my hemlock baseboard since the round corners are poplar. I gave up and will cut them from the baseboard stock but didn't want to guess on where the corner starts. This should give me a line to measure to. On line videos of how to cut the 22.5 degree cuts was helpful
Shawn D on Jan 31, 2019
Just did a job that had bull nose base boards.
Sheldon S on Jan 31, 2019
Doing trim work around the house full of bullnose corners
William F on Jan 28, 2019
I have Bullnose corners
Freddie P on Jan 27, 2019
Need it
Richard C on Jan 24, 2019
Saw YouTube demo, seemed like a no-Brainerd to get one.
Wayne P on Jan 17, 2019
Seems like it would make it easier.
Alexander L on Mar 20, 2020
Need one to be able to properly trim corners in home
Dennis G on Jan 29, 2020
Using the bullnose trim gauge...I line everything up and fits great. When I nail the midle bullnose piece, it shifts and is a little off. Happened 5 out of 5 times. What am I doing wrong?
Bullnose 5150 on Feb 24, 2017
BEST ANSWER: Just nail the side pieces and glue the center piece to the sides. Nailing into curved metal can cause the small trim to shift.
Can I use this tool to cut out the middle piece?
Bruce on Aug 31, 2017
BEST ANSWER: No, you can't. However, the instructions are very clear on how the piece needs to be cut.
will this tool help with 22.5 degree inside and outside pieces?
rob w on Dec 26, 2017
BEST ANSWER: Yes. This tool makes bullnose corners easy. Just follow the simple instructions and you can’t go wrong.
At which degree are the pieces cut?
Michael S V on Feb 8, 2020
BEST ANSWER: Normally 90• bi angle is 45. In this case you have two 45• angles so answer is 22.5• cuts
I hope this answer your question
Will this work on square corners not bullnosed?
DAVID K on Feb 16, 2019
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