ABEC-1 precision grade, maximum speed 34000, with grease. Pre-lubrication, low friction, no maintenanceSingle for supporting and axial load applicationsEasy to disassemble and reinstall. Excellent products for medium loads: skateboards, rollers, electric motors with inline blades, bicycles, motorcycles, electric hand tools, etc. in many other rewinding applicationsIn many other rolling applications, by mounting the used skateboard on the electric motor with the paddle of the scooter, bicycle and motorcycle wheels, cars, electric hand tools, etc. Check the size/dimensions or accuracy class (if suitable for your equipment). Because, the inner clearance is C3, so that the clearance between the inner ring and the outer ring is CN (normal) to compensate for thermal expansion. Heat treatment is performed to increase the hardness to improve wear resistance. It has deep ball grooves in both rings and can withstand large and axial loads; Straight holes can be equipped with cylindrical shafts; The nylon cage prevents the balls from touching each other during use, which reduces friction, vibration and noise. Removable symmetrical seals on both sides prevent the ingress of contaminants and maintain lubrication during production. The ball bearing is suitable for skateboarding, roller skating and other roller applications. Size: 8x22x7mm Material: Carbon Steel Color: Silver + Black Package Content: 60 *Only the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.