Inverted External Ring System of Measurement Inch Location Style External Thickness 0.042 in Fits Shaft Diameter 7/8 in For Bore Diameter Not Applicable Fits Groove Diameter 0.821 in Fits Groove Width 0.046 in Fits Groove Depth 0.027 in Free Inside Diameter 0.81 in Clearance Diameter 1.1 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type External Inverted Ring Thickness Tolerance +/-0.002 in