Available Screws : Hex Head Silicon Bronze Cap Screws 1/2-13 Hex Head Silicon Bronze Cap Screws 1/4-20 Hex Head Silicon Bronze Cap Screws 3/8-16 Hex Head Silicon Bronze Cap Screws 5/16-18 Standard Specification Followed : Silicon Hex Head Bronze Cap Screws Are Full Body Cut Thread Spec. ANSI/ASME B18.2.1 Available Sizes : 2", 2-1/2", 3", 3-1/2", 4", 4-1/2", 5", 6", 7", 8", 9", 10",