2 mm, Clearance Diameter 18.1 mm Thk,PK100, System of Measurement Metric, Location Style External, Thickness 1.1 mm, Fits Shaft Diameter 10 mm, For Bore Diameter Not Applicable, Fits Groove Diameter 9 mm, Fits Groove Width 1.15 mm, Fits Groove Depth -, Free Outside Diameter 18.