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Cheat Sheet - Test Fit Card

Cheat Sheet - Test Fit Card

Regular price $15.99 USD
Regular price Sale price $15.99 USD
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Not sure what size bearing or pivot a knife uses?

Use the Test Fit Card as a cheat sheet to quickly determine knife pivot size and bearing ball size. Simply insert the cage bearing or pivot barrel from the knife into the different sized slots and holes to figure out which their sizes. 

The Test Fit Card is machined from 6061 aluminum and the engravings are filled with enamel paint.


1.75" wide x 2.75" long x 0.100" thick

Test for the following sizes

Bearing sizes: 3/32", 1/16", 3/64" (1.2mm), 1mm and 2mm

Pivot sizes: 1/8", 3/16", 1/4", 4mm, 5mm, 6mm

Instructions for use

Find Pivot Size: Starting with the smallest hole, attempt to insert the pivot barrel into each hole until the barrel is able to pass through the hole.

Find Bearing Size: Starting with the smallest slot, attempt to insert the cage bearing through each slot until the bearing is able to pass through the slot. 

View full details

Bearing Compatibility

The below knives have been found to work with this bearing.
Click here to view the full compatibility chart.

Customer Reviews

Based on 62 reviews
Miroslav N
Test Fit Card

Now I can easily see the size of the bearings in a short time and order what I need, extra.

Charles Campbell
Nice to have

Seems like I nice item to have . To know what size bearings you need to upgrade. I really like the skiff bearing I purchased. My knife seems smoother and more blade feels stronger as well. Nice quality bearing.

Michael Conley
Size Matters.

Very Helpful.

Gary Royal
Test fit card

Very handy little tool.


It was just what I needed for my knife collection.
Is way I can modify my knives