Retaining Ring External 4 mm Thk System of Measurement Metric Location Style External Thickness 4 mm Fits Shaft Diameter 180 mm For Bore Diameter Not Applicable Fits Groove Diameter 175 mm Fits Groove Width 4.15 mm Free Inside Diameter 170.5 mm Clearance Diameter 210 mm Material Steel Finish Plain Material Grade/Class Ungraded Ring Type External Retaining Ring Clearance Diameter Type Expanded Material Quality Standards DIN 471 Pack Size Small Pack