Strong and light-weight, CNC machined from 6061 aluminum alloy and anodized for excellent corrosion resistance and a matte-black finish. Torque spec: 3.4 Nm (30 in-lbs) on bubble level screw. OVERVIEW This is included with the M-BRACE mount, you don't need to purchase one unless you need more than one level. 6061 Aluminum Picatinny (MIL-STD-1913) rail Compatible with American Rifle Company M-Brace Mount Weight with mounting hardware 0.3 oz (8 grams) Proudly engineered and manufactured in the USA Mfg: American Rifle Company