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Cheat Sheet - Test Fit Card - Anodized

Cheat Sheet - Test Fit Card - Anodized

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 11 reviews
Michael Grossman
Skiffs for the Win 🥇

Back for more skiff bearings. Makes my knives smooth and feels like glass. Highly recommend and thanks again for fast shipping.

Chris Leal
Great Product

It makes things a lot easier than calipers.

Shane Hatcher

Very helpful tool.

Robert Iversen
Such a great tool to help find the right caged bearings more quickly.

If you swap caged bearings by putting in Skiffs, then this a no brainer and helpful tool for everyone. Love this thing!


Simple and works great!