SPECS: 6061 T6 aluminum and 4140 steel, matte black. Standard & Tritium Rear Sights - 1-3/8" (3.5cm) overall length, 17/8" (4.8cm) high (extended), 7/8" (2.2cm) high (folded). 360 Series Rear - 1-3/8" overall length, 1-7/8" high (extended), 1-3/16" (3cm) high (folded). Trajectory calibrated for carbines with 16" long barrel equipped with A2 front sight or aftermarket sight of equivalent height.