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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
92 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bullnose corner gauge
Great find
May 25, 2020
1 year ago
A must have jig tool.
Awesome resourdd CD r to have for marking and measuring the bull nose corners for baseboard. Highly recommended and works exactly as it is designed for. The only drawback is if you have not removed a certain section of old baseboard around the return part of the bill nose you will not be able to mark Crüe measurement closer to the floor.
May 5, 2020
2 months ago
Woodworking Experience:
If you are doing any finish carpentry that involves rounded corners, you need this tool. It is so simple it’s genius. It’s also an amazing time saver!
May 4, 2020
2 months ago
Works great for base and crown molding!
April 14, 2020
3 months ago
Woodworking Experience:
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
3 months 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
3 months ago
Work saver. Extremely accurate.
February 23, 2020
4 months ago
Works great
Simple but works great. Makes mitering crown or base around a bull nosed corner a snap
December 25, 2019
1 year ago
Woodworking Experience:
This works great!
November 1, 2019
9 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
10 months ago
Woodworking Experience:
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Browse 6 questions Browse 6 questions and 64 answers
Why did you choose this?
Rockler Store
As a trim carpenter this would be a tool that would used very much that could make my job easier.
Jeff M on May 28, 2020
I have these corners, thought I would try it.
Cirick on May 22, 2020
As a trim carpenter this would be a tool that would used very much that could make my job easier.
Jeff M on May 28, 2020
its a very useful tool when you do certain types of trim work.
Matthew C on May 24, 2020
I have these corners, thought I would try it.
Cirick on May 22, 2020
I am starting to replace molding in the house and without a gauge like this cutting the molding to length is difficult to get right.
Mike B on May 21, 2020
Finish Carpentry TV on YouTube
Christopher C on May 19, 2020
may need to do some trim work in near future
Mike B on May 18, 2020
I watched a Professional install crown molding and he used this tool. Good enough for me.
Don D on May 17, 2020
Replaced bathroom baseboard moulding and it was a challenge getting the line near the corner correct.
Glen George L on May 16, 2020
My husband asked me to buy it. No clue
Hilary on May 15, 2020
DIY project around my house
Martin D on May 14, 2020
To help me with replacing baseboards on bullnose corners. I watched a video with somebody using it and thought it would be a big help taking some of the guess work out of it.
Paul J on May 14, 2020
Remodeling my kitchen and dining room <br />Adding a wall and putting bullnose corners on wall and doorways
Daniel M on May 13, 2020
To be more accurate an to save time
Gilbert S on May 12, 2020
I install trim and hopefully this will make it easier and be more efficient for me
Walter H on May 11, 2020
Time Saver
Eric P on May 9, 2020
I have bullnose corners all over my house.
Ramiro Y on May 4, 2020
I have been putting off replacing floors because i could do the complicated cuts the pros did on my home. this will make it so much easer<br /> <br />Thank you so much
Robert A on May 3, 2020
to do trim in my home
Holly L on May 3, 2020
Necessity for my business!
Raymond K on Apr 29, 2020
Simple to use and works great!
Jarrod F on Apr 26, 2020
Looks like a simpler way to measure.
Marty on Apr 22, 2020
I'm replacing floor moldings in three rooms and several corners are bullnose. Hopefully this tool will make measurements easier as well as defining the exact location of the center piece.
Donald A on Apr 14, 2020
makes my life so much easier on these rounded corners
Gerald J on Apr 10, 2020
It was recommended by a good trim carpenter.
Scott C on Apr 3, 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
its a very useful tool when you do certain types of trim work.
Matthew C on May 24, 2020
I am starting to replace molding in the house and without a gauge like this cutting the molding to length is difficult to get right.
Mike B on May 21, 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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