Countersunk Washer Material Grade/Class Not Graded Material Steel Finish Nickel Plated For Screw Size 3/8 in Maximum Inside Diameter 0.46 in Outside Diameter 1 in Countersink Angle 82 Degrees Overall Height 0.25 in System of Measurement Inch For Use With Flat and Oval Head Countersunk Screws Pack Size Small Pack Rockwell Hardness B70 Package Quantity 100