Countersunk Washer Material Grade/Class 6/6 Material Nylon Finish Plain For Screw Size #8 Maximum Inside Diameter 0.171 in Outside Diameter 33/64 in Countersink Angle 82 Degrees Overall Height 0.115 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