Retaining Ring, System of Measurement Metric, Location Style External, Thickness 1.75 mm, Fits Shaft Diameter 20 mm, For Bore Diameter Not Applicable, Fits Groove Diameter 19 mm, Fits Groove Width 1.85 mm, Fits Groove Depth 0.5 mm, Free Inside Diameter 18.5 mm, Free Outside Diameter Not Applicable, Clearance Diameter Not Applicable, Material Spring Steel, Finish Black Phosphate, Material Grade/Class 1060-1090, Tensile Strength Not Applicable, Ring Type External Retaining Ring