Retaining Ring External 1.5 mm Thk PK50 System of Measurement Metric Location Style External Thickness 1.5 mm Fits Shaft Diameter 28 mm For Bore Diameter Not Applicable Fits Groove Diameter 26.6 mm Fits Groove Width 1.6 mm Free Inside Diameter 25.9 mm Clearance Diameter 37.9 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