20PCS Carbon Steel Bearings 684ZZ Deep Groove Ball Bearing Double Shield 4x9x4mm
Ball BearingsGeneral Information：[1]Pre-Lubricated, Easy to maintain[2]Shields on BOTH SIDES of the bearing to keep dust out. Suitable for high speed operation[3]Made from Carbon Steel, durability and resistance to under heavy loads[4]ABEC Tolerance 1 (P0) for most general use[5]Size: 684ZZ (Inner Dia.=4mm, Outer Dia.=9mm, Thickness=4mm).