Fangrui Product Details Precision Grade Abec-1, Maximum Speed 34000, With Grease. Pre-grease, Low Friction, No Maintenance Single Row Radial Ball Bearings For Applications Supporting Radial And Axial Loads Easy To Disassemble And Reinstall. Products For Medium Loads: Skateboards, Inline Skates, Scooters, Inline Blade Electric Motors, Bicycles, Motorcycles, Electric Hand Tools, Etc. 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 Tools, Etc. For Ball Bearings, The Radial Internal Clearance Is C3, So That The Radial 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 Improve Wear Resistance. It Has Deep Ball Grooves In Both Seat Rings And Can Withstand High Radial And Axial Loads Its Straight Holes Can Be Fitted With Traditional Cylindrical Shafts The Nylon Cage Prevents The Balls From Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store