Wedge Lock Washer Lock Washer Type Wedge Lock Finish Plain Material Stainless Steel For Screw Size 1/2 in Inside Diameter 0.53 in Outside Diameter 1 in Assembly Thickness 0.13 in Assembly Thickness Tolerance +/-0.01 in Dimensional Standards DIN 25201 Material Grade/Class 316 Pack Size Small Pack Rockwell Hardness HRC52 System of Measurement Inch Package Quantity 100