Material Avaliable Steel, Stainless Steel And Brass Fetures & Advantangesï¼? 1.no Way To Turn The Sex Bolt, Because Architectural Sex Bolts Have Smooth Truss Heads - No Drive. 2.the Knurled Barrel Keeps The Sex Bolt From Spinning While The Flat Head Screw Is Tightened From The Other Side. 3.strong, Secure, Easy To Assemble. 4.good Looking Solution For Many Sheet Metal Anchoring Applications. 5.particular Useful In Fiberglass Marine Applications. Applications 1.door And Lock Accessory Mounts 2.hurricane Protection Shutters 3.elevator Protection Gates 4.hvac Ventilation 5.docks And Construction Projects 6.architectural - Railings, Cabinetry, Shutters, Seats, And More. Other Size, Material Are Available Upon Request