Six, interchangeable, fiber optic rods offer a choice of sights to match nearly all shooting and light conditions. The glowing, orange and green light pipes provide a crisp sight picture that gives greater contrast against dark target backgrounds. SPECS: Steel, black, matte finish. Available in: .315" (8mm), .380" (9.7mm), .420" (10.7mm), .500" (12.7mm) height. Standard 3/8" dovetail. Light pipes: 1/16" (1.5mm), 3/32" (2.4mm), 1/8" (3.1mm), diameter. .720" (18m) long.