Metric External Heavy Duty Ring System of Measurement Metric Location Style External Thickness 1.75 mm Fits Shaft Diameter 22 mm For Bore Diameter Not Applicable Fits Groove Diameter 21 mm Fits Groove Width 1.85 mm Fits Groove Depth 0.5 mm Free Inside Diameter 20.5 mm Free Outside Diameter Not Applicable Clearance Diameter Not Applicable Material Steel Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Heavy Duty External Ring