grade ABEC-1, maximum speed 34000, with grease. Pre-grease, low friction, no maintenance Single row for applications supporting and axial loads Easy to disassemble and reinstall. Perfect products for medium loads: skateboards, inline skates, scooters, inline blade electric motors, bicycles, motorcycles, electric hand , etc. In many other scrolling applications In 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 , etc. Please check the size / dimensions or accuracy class (if suitable for your equipment). For , the internal clearance is C3, so the slack between the inner ring and the outer ring is greater than 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 , 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 bearing is suitable for skateboard, inline skating and other skating applications. size:8x22x7mm Material:Carbon steel colour:Silver + black Package Contents: 60 * Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.