Countersunk Washer Material Grade/Class 18-8 Material Stainless Steel Finish Plain For Screw Size 1/4 in Maximum Inside Diameter 0.281 in Outside Diameter 1 1/2 in Countersink Angle 82 Degrees Overall Height 0.281 in System of Measurement Inch Color - For Use With Flat and Oval Head Screws Industry Standards AMPG 2002 FIN.04 ASTM A582 Pack Size Small Pack Resistance Properties Chemicals Resistant Corrosion Resistant Dye Resistant Food Resistant Nitric Acid Resistant