Check the listing for details. (100) PREMIUM Black Nylon #10 Washers for IT, Telecom and Network Rack Screws. Condition: New, Made in USA. Listed at 10.99 USD. Each Item is (100) #10 X 13/32" black nylon washer DBLITTLE SKW040 One Hundred #10 X 0.409" black nylon washers DBLITTLE SKW040 are premium quality quality 6/6 polyamide black nylon #10 washers Made in the USA. These washers do not deform under normal torque like less expensive plastic look-alike washers. DBLITTLE SKW040 is primarily used for rack washers with #10-32 rack screws to protect 19" rack mount IT, Telecom, and Network equipment from "rack rash" or marring the surface finish at mounting points. We buy in bulk so we can sell you original first quality products for the same price you would normally pay for economy grade hardware. Inside diameter 0.192" (3/16") Outside diameter 0.409" (13/32") Thickness 0.62" (1/16") non-marring with most surface finishes Rockwell M-scale hardness 71 185 degree F max temperature Made in USA Black 6/6 Polyamide (nylon) Use for #10 rack screws on rack mount IT, Telecom, and Network equipment for surface protection at mounting points