Metric Self-Locking Ring System of Measurement Metric Location Style External Thickness 1.2 mm Fits Shaft Diameter 12 mm For Bore Diameter Not Applicable Fits Groove Diameter Not Applicable Fits Groove Depth Not Applicable Free Inside Diameter 11.6 mm Free Outside Diameter Not Applicable Clearance Diameter 21.8 mm Material Spring Steel Material Grade/Class 1060-1090 Tensile Strength Not Applicable Ring Type Self-Locking Friction Ring Package Quantity 25