Finally, no compromises....Space Age Strength and Dramatic weight savings. The Ultra-Lite's unique one piece design delivers strength superior to steel for about 1/6 the weight. Takes the place of traditional backing plate and nut. Self-tapping. Made from a special nylon composite for superior strength. Will fit all 5/16" push-through studs. GUARANTEED 4-6 pound weight loss in 1 hour! (Based on 144-240 studs.) Also available, Heavy Duty Ultra-Lites for 1.15 studs or longer ( 1.437 total length or longer).