Highly visible, bright red or green, aiming point lets you concentrate on following the target and making the shot. Improves sight acquisition in all light conditions for fast, almost automatic alignment. Machined aluminum body provides years of rugged service. SPECS:Body: aluminum, black, anodized finish. Bead: .250' (6.35mm) long, .05' (1.3mm) dia. Shank length: 3/32' (2.4mm). Thread sizes 3-56 tpi, 5-40 tpi, 6-48 tpi.