Single Row Angular Contact Ball Bearing, with high precision level P4 (ABEC 7),to be specially usable ... ), to be specially usable for Electric Spindles operating with high-speed, Grinding Head operating with high-speed, Gyro Motor, etc. Product Specifications:· Reach ... : bore diameter of inner ring 3mm-12mm · Structure design: Open, with Shield and flanged· High rotating speed, Low noise, Low vibration ...