Internal Light Duty Spiral Ring System of Measurement Inch Location Style Internal Thickness 0.015 in Fits Shaft Diameter Not Applicable For Bore Diameter 3/8 in Fits Groove Diameter 0.395 in Fits Groove Width 0.018 in Fits Groove Depth 0.01 in Free Inside Diameter Not Applicable Free Outside Diameter 0.398 in Clearance Diameter Not Applicable Material Steel Finish Plain Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Internal Light Duty Spiral Ring