Perfect lock miter joints made easier than ever.
Over 900,000 Grr-rippers Sold
Get 10% the Lock Miter Bit + 1/2 Gauge.
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FITFINDER Lock Miter Bit (Online Exclusive)
Exclusive Offer
Get 10% the Lock Miter Bit + 1/2 Gauge.
- The FITFINDER Lock Miter Bit creates perfect lock miter joints on stock from 1/2" to 3/4" (13-19mm) thick.
- The patent pending Center Finding Platform helps you set the correct bit height instantly, so you only need to adjust the fence.
- Built-in Glue Wells account for excess glue to provide better fitting and easier to clamp joints.
- The FITFINDER 1/2 Gauge allows you to find the 1/2 thickness of any material up to 3-inch thick
- Set fences, transfer cutting depths, and center stock on the lathe with no math or measuring.
What's Included:
- Lock Miter Bit
- 1/2 Gauge
or buy separately
Exclusive Offer
FITFINDER
Perfect lock miter joints made easier than ever.
- The FITFINDER Lock Miter Bit creates perfect lock miter joints on stock from 1/2" to 3/4" (13-19mm) thick.
- The patent pending Center Finding Platform helps you set the correct bit height instantly, so you only need to adjust the fence.
- Built-in Glue Wells account for excess glue to provide better fitting and easier to clamp joints.
- The FITFINDER 1/2 Gauge allows you to find the 1/2 thickness of any material up to 3-inch thick
- Set fences, transfer cutting depths, and center stock on the lathe with no math or measuring.
100% Satisfaction Guaranteed
- Priority Mail Express: No delays.
- Priority Mail: 1-2 day delay. No delays for local delivery.
- First-Class Package Service: 1-2 day delay.
Automatic Measurements
The lock miter joint can’t be beat for making columns, newels, posts and cabinet scribes, but the bit and stock have to be exactly centered together. Only the Microjig Lock Miter Bit features a Center Finding Platform in the bit body to set the correct bit height the first time.
The FITFINDER was conceived while founder and inventor, Henry Wang, was developing the Dado Stop. While the Dado Stop solved the problem of cutting the width of a dado, setting the dado’s depth for half-laps still proved challenging. Henry realized that the solution was already there—from a Greek mathematician that lived over 2 millenia ago—Pythagoras. He applied this simple principle of geometry to a common woodworking process, and the FITFINDER was born.
No math or measuring required.
The FITFINDER 1/2 Gauge automatically finds the center of your workpiece using simple geometry. Lock the measurement in place and set the cutting depth of your saw blade/router bit, or set fences.
- Match the material's thickness - Place material under P2, then lower P2 so that it rests on top of the material.
- Find the 1/2 point - The bottom of P3 automatically adjusts to exactly 1/2 the thickness of the material.
- Transfer measurement - Lock in the measurement and use the FITFINDER to set cutting depths and fences.
Consistently well-fitted lock miter joints quickly and easily.
The FITFINDER 1/2 Gauge allows you to find the 1/2 thickness of any material up to 3" thick and works perfectly with the Lock Miter Bit.
Once the height is correct, only the fence needs to be adjusted to perfect the fit. Greatly simplify router table setup for perfect joints with minimal test cuts and wasted stock.
Create perfectly fitting joints with zero guesswork, set fences and transfer cutting depths instantly—all with no math or measuring.
Use it around your shop.
Set fences for resawing.
Set fence position and resaw material on the bandsaw with zero guesswork.
Center stock on the lathe.
Find the center of stock and mount material on the lathe for safer spindle turning.
Set precise cutting depths.
Lock in the measurement and transfer to the router or table saw to set cutting depth for flawless lap joints.
Center router bits.
Quickly and accurately find the halfway point of material.
Perfectly fitting joints. Zero guesswork.
Overlap Joints
Half Lap Joints
Rail & Stile Joints
1. Set stock
2. Tighten knobs
3. Mark center
Use it around your whole shop.
Features.
FITFINDER Lock Miter Bit (Online Exclusive)
Frequently Bought Together
MATCHFIT Dado Stop
MATCHFIT Dado Stop
MATCHFIT Dado Stop Pro
MATCHFIT Dado Stop Pro
GRR-RIPPER+
GRR-RIPPER+
MATCHFIT Dovetail Clamp Pro
MATCHFIT Dovetail Clamp Pro
What people are saying.
Take the Trial and Error out of Lock-Miter Setups
You’re able to quickly and easily center router bits on stock
Effortlessly find the halfway point.
Well worth the essential tasks it performs
Perfectly fitting lap joints
Got questions?
Does the FitFinder Work with any other Lock Miter Bit?
Our Lock Miter Bit works with our FitFinder because we have a shelf milled into the bit to set the height from.
No other Lock Miter Bit has this feature, so they do not work as well with our FitFinder 1/2 Gauge.
Can I use the FITFINDER Lock Miter Bit on plywood?
You can use the FITFINDER Lock Miter bit in plywood, but you may need to adapt how you work just a bit.
As you know, plywood is made of layers with the grain running perpendicular between the ply’s. So every cut you make on it with any bit is cutting both with and across the grain. This means it will not cut as smoothly as with the grain, and there is likely to be some fuzz or tear-out in the cross grain sections.
Make a test cut on a scrap of the same plywood to see how it works. I would recommend a two-cut solution: Set the bit up as normal, then attach a cover strip of 1/8” or even 1/16” Masonite or laminate on your router table fence with a notch cut out for the bit.
Make your cuts with the strip in place, then remove it and re-run the parts as a cleanup pass. The extra light cut should be much easier and cleaner.
Finally, our Lock Miter bit is designed for stock 1/2” to 3/4” thick. 1/2” plywood is typically less than 1/2” thick, so the results with it are not great.
Perfect Half-Laps with FitFinder and MatchFit Dado Stop Pro
FITFINDER 1/2 Guage - Marking Knife Tip
FitFinder Lock Miter Bit - Instructional Video
FitFinder Influencers 2022
Specifications.
Router
Available in 1/2" shank size.
Any material up to 3" thick.
FN12MB-050-0750LM
Designed in USA
Made in Taiwan
Patent Pending
Customer Reviews.
Our Story
Family-Owned & Operated
Established 2001.
For beginners and pros alike, Microjig is reimagining an ancient craft and changing the way you work with wood.
Build your projects with more protection, more precision, and more passion. Work safer. Work smarter.
Designed in the USA by Woodworkers
Protecting Users in 37 Countries and Counting
1% Donated toNon-Profits andCharities
It all started in a garage workshop...
Henry was working on an intricate project and was challenged with cutting thin strips on a table saw. His frustration with traditional methods sparked one of the most innovative woodworking tools to come out in decades.
After countless hours and prototypes, the Grr-ripper was born. Henry has continued to innovate, and Microjig now offers multiple unique product lines all over the world.
WOOD Innovate Award
WOOD Innovate Award
Rated 5/5
Rated 4.8/5
Best for Table Saw Safety
#1 Best Overall Push Block
Best High-end Push Block
Best Multifunctional Push Block
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Award Winner
