Superior Electric SE 608ZZ - Replacement Ball Bearing - 8x22x7(mm) replaces Milwaukee 02-04-0820, Makita 211031-6, Bosch 2610017348 Side 1: Shield | Side 2: Shield | Inner Diameter: 8 mm Outer Diameter: 22 mm | Width: 7 mm Axial Load: 0.9 KN | RPM:  4000 Tolerance: ABEC-3 Class 3 | Material: E51100, 100Cr6 Bearing Life: 3 Years, varies on application