This bearing is finished by CNC machining, with of completion, smooth inner diameter and outer diameter, which ensures that the ball not fall off. It is made of H62 brass+ceramic balls. Cage bearings allow more balls to be placed around the cutter shaft than standard cage bearings. This provides more support for the blade and reduces the pressure on each ball. The ceramic balls are in the disk, but still float freely to prevent binding. Only suitable for the sixth generation for Rick Hinderer Knives XM-18. Also applies to: for ZT0392, ZT0920, 0456, 0392, 0393 for Eklipse for for Jurassic for Halftrack Size: Outside diameter: 10.6MM Inner diameter: 6.4MM Brass frame: 1MM Ceramic ball: 1.2MM Colour:As Shown Material:H62 brass+ceramic ball Package Contents: 2 sets * tool holder bearing accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.