4PCS 8x30x8.5mm Ball Bearing Guide Pulley Roller Double Shielded GCr15
Double Metal Shielded BearingsGeneral Information：[1]Suitable for all kinds of industrial equipment, micro motor, small rotary motor, office equipment and so on[2]bearings are shielded on both sides to keep lubricant in[3]Chromium Steel long-life bearings, smooth and low noise[4]ABEC Tolerance 1 (P0), Z2 Noise Level for most general use[5](I.D.=8mm, O.D.=30mm, Thickness=8.5mm).