Wedge Lock Washer Lock Washer Type Wedge Lock Finish Plain Material Stainless Steel For Screw Size 1/4 in Inside Diameter 0.28 in Outside Diameter 0.53 in Assembly Thickness 0.09 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 200