Retaining Ring, System of Measurement Metric, Location Style External, Thickness 2 mm, Fits Shaft Diameter 30 mm, For Bore Diameter Not Applicable, Fits Groove Diameter 28.6 mm, Fits Groove Width 2.15 mm, Fits Groove Depth 0.7 mm, Free Inside Diameter 27.9 mm, Free Outside Diameter Not Applicable, Clearance Diameter Not Applicable, Material Steel, Finish Black Phosphate, Material Grade/Class Not Graded, Tensile Strength Not Applicable, Ring Type External Retaining Ring