Wedge Lock Washer Lock Washer Type Wedge Lock Finish Delta Protect Material Steel For Screw Size 2 1/2 in Inside Diameter 2.64 in Outside Diameter 3.74 in Assembly Thickness 0.28 in Assembly Thickness Tolerance +/-0.03 in Dimensional Standards DIN 25201 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness HRC46 System of Measurement Inch