Precision grade ABEC-1, maximum speed 34000, with grease. -grease, low friction, no maintenanceSingle for applications supporting and axial loadsEasy to disassemble and reinstall. Perfect products for medium loads: skateboards, inline skates, , inline blade electric motors, bicycles, motorcycles, electric hand tools, etc. In many other scrolling applicationsIn many other rolling applications, refitting a worn skateboard to an inline blade electric motor of a skateboard scooter, wheels of bicycles and motorcycles, automobiles, electric hand tools, etc. check the size / dimensions or accuracy class (if suitable for your equipment).For , the internal clearance is C3, so that the slack between the inner ring and the outer ring is CN (normal) to compensate for thermal expansion. Heat treatment is performed to increase hardness to wear resistance.It has deep ball grooves in both rings and can withstand high and axial loads; straight holes can be fitted with cylindrical shafts; the nylon cage prevents the balls from contacting each other during use, Which reduces friction, vibration and noise.Removable single lip contact seals on both sides prevent contaminants from entering and maintain lubrication during manufacturing. The ball is suitable for skateboard, inline skating and other roller skating applications.size:8x22x7mmMaterial:Carbon steelcolour:Silver + blackPackage Contents:60 * Only the above package content, other products are not included.Note: Light 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.