Inverted Internal Ring System of Measurement Inch Location Style Internal Thickness 0.05 in Fits Groove Diameter 1.528 in Fits Groove Width 0.056 in Fits Groove Depth 0.045 in Free Outside Diameter 1.552 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Ring Type Internal Inverted Ring Clearance Diameter Type Free OD Thickness Tolerance +/-0.002 in Standards REACH Compliant RoHS Compliant Groove Width Tolerance +/-0.004/0.000 In.