Quantity Unit: 5 pairs Oversize: 0.00 mm for bearing clearance: from 0.006 mm, until 0.03 mm for housing diameter: from 51.6 mm, until 51.619 mm Width: from 21.5 mm, until 21.8 mm for wall: from 1.805 mm, until 1.811 mm for shaft diameter: from 47.95 mm, until 47.965 mm