6301ZZ (I.D.=12mm, O.D.=37mm, Thickness=12mm); 6301ZZ bearing are shielded on BOTH SIDES to keep lubricant in; Chromium Steel long-life bearings, smooth and low noise.
6302ZZ (I.D.=15mm, O.D.=42mm, Thickness=13mm); 6302ZZ bearing are shielded on BOTH SIDES to keep lubricant in; Chromium Steel long-life bearings, smooth and low noise.