Truglo Metal Long 2.6mm Bead Sight - Green. The TRUGLO Lon-Bead universal shotgun sight is the iindustry’s favorite bead replacement. CNC machined. Fiber diameter is .078". Fiber length is 0.5". TruGlo Longbead Green Shotgun Sight (2.6mm Base, Green) is machined in metal for ultimate strength and reliability. Built to fit Remington shotguns, the TruGlo Longbead Shotgun Sight features a fiber optic for increased accuracy and performance.