Large diameter" CNC-machined front sight that incorporates a dual-color light gathering fiber optic rod for high visibility and faster sight acquisition" even in poor lighting. Universal design fits most shotguns. Gunsmith installation may be required. Fiber diameter is .120" and length is 0.5". Includes mounting screws.Features: Truglo Fat-Bead Universal Sight Fits All Gauges Shotgun Red/Green Requires Bead Replacement Fiber diameter .120" Fiber length .5"