Light weight and strong, our lug nuts are proof-load tested to 160,000 PSI. Each one is individually machined from special high quality steel, then through-hardened and tempered for strength & durability. The triple-nickel chrome plating is guaranteed for life not to chip, peel or rust. For street use, the black nylon allen plug can be left in place. For the strip or pro street cars, unscrew the plug to allow the use of extra long NHRA approved studs. Individual sets supplied with polished stainless steel center hole washers unless otherwise noted. Bulk boxes do not contain washers.