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Cheat Sheet
Test Fit Card


Regular price $14.99

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. 

Customer Reviews

Based on 30 reviews
Antonio Clemente
Big results from little investment

Easy to size existing bearings for ordering replacements. First time user & it made me feel accomplished. No mistakes, easy process & great result. Must have tool

A Monaco

Very well-made all metal construction

Brian Lang
Always quality

I have ordered quit a few sets a bearings from Skiff and have been impressed by the quality and craftsmanship.

Brandon Ruyter

It’s small so it fits in my maintenance pouch perfectly. Clean old knives and check the bearing size to get some upgraded Skiffs.

Test Fit Card is super easy

Really easy guide for bearing fitment. Even if you know the bearing size of the knife you have, what about your next knife purchase? Great to have and easy to use for a no guess replacement to knife bearings. And of course the Skiff bearings I received were great.