Slotted Washer, Finish Plain, Flat Washer Type Slotted Flat Washer, For Screw Size 1/2 in, Material Stainless Steel, Material Grade/Class 18-8, Maximum Thickness 0.375 in, Minimum Thickness 0.375 in, Outside Diameter 1 7/8 in, Pack Size Small Pack, Rockwell Hardness B83 to B95, Slot Width 0.531 in, System of Measurement Inch, Thickness Tolerance +/-0.010 in