Large diameter, CNC-machined front sight that incorporates a light gathering fiber optic rod for high visibility and faster sight acquisition, even in poor lighting. Universal design fits most shotguns. FEATURES: a The industry's favorite bead replacement. a Available in metal or ultra-tough composite. a Fiber diameter is .078". a Fiber length is 0.5". a Universal model is metal and includes different size mounting screws. Fits: Universal thread size