Countersunk Washer Material Grade/Class 6/6 Material Nylon Finish Plain For Screw Size #6 Maximum Inside Diameter 0.143 in Outside Diameter 7/16 in Countersink Angle 82 Degrees Overall Height 0.1 in System of Measurement Inch Color Black For Use With Flat and Oval Head Countersunk Screws Maximum Temperature 185 Degrees F Minimum Temperature -40 Degrees F Pack Size Small Pack Rockwell Hardness - Thickness Tolerance +/-0.005 in Package Quantity 20