The Seco Aluminum Prism Assembly 6422-02-FOB features a 62 millimeter diameter prism with a copper-coated canister. The canister has a waterproof M20 universal mounting thread that mounts easily to the aluminum tilting prism holder. The prism can be mounted in a 0 or -30 millimeter offset position while the holder offers a 115 millimeter tilting axis height and a front clamp that locks your desired height in place. The holder's steel target is 5.5 inches long, 7 inches wide, and 0.05 inches thick. It is also fluorescent orange and black for maximum visibility.