Metric External Push-On Ring System of Measurement Metric Location Style External Thickness 0.25 mm Fits Shaft Diameter 4 mm For Bore Diameter Not Applicable Fits Groove Diameter 3.9 mm Fits Groove Width 0.4 mm Fits Groove Depth Not Applicable Free Inside Diameter 3.8 mm Free Outside Diameter 9 mm Clearance Diameter Not Applicable Material Spring Steel Material Grade/Class 1060-1090 Tensile Strength Not Applicable Ring Type External Push-On Ring Clearance Diameter Type Free OD