Countersunk Washer Material Grade/Class Not Graded Material Steel Finish Nickel Plated For Screw Size #12 Maximum Inside Diameter 0.289 in Outside Diameter 21/32 in Countersink Angle 82 Degrees Overall Height 0.125 in System of Measurement Inch For Use With Flat and Oval Head Countersunk Screws Pack Size Small Pack Rockwell Hardness B70 Package Quantity 100