Tensile Strength Exceeds 1100 Pound Per Bolt; Acme Thread Design Provides Increased Strength and Smoother, Faster Threading; 100% Corrosion Proof Nylon Bolts; Improved Adaptability - Open End Nut Now Fits 1/2 Inch Sockets and Fits Under Most Bolt Caps; Bolt Base Loads into any Flange; Unique Design Allows for Quick and Hassle Free Installation; Pyramid Base Design Keeps Bolt Upright and Does Not Allow Bolt to Spin in Flange, Eliminating Need to Double Nut Bolt; Lifetime Limited Warranty; Made in USA