Universal mounting hardware (3-56, M3 x 0.5, 5-45, 6-48 screws) fits most shotguns, including Remington, Mossberg, Benelli, and Beretta; FiberLok: fibers stay secure and never shift; Crafted from billet steel with a QPQ Nitride finish; 13.3 mm CNC-machined fiber optic; With a set-screw system that locks fibers securely, preventing breakage and allowing instant color swaps (red, green, orange, white, black); Its optimized 60/40 POA/POI ratio ensures consistent accuracy; Perfect for 3-Gun, trap, skeet, sporting clays, and field hunting; Five Fiber Colors Included - Red, Green, Orange, White, and Black