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 their sizes.

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

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.