Specifications: Locking Levers Securing Method 0 MOA Inclination 36mm Ring Diameter 1.240" / 31.5 mm Height to Bottom of Ring 1.870" / 47.5 mm Height to Centerline 3.000" / 75 mm Length Inside of Rings 4.921" / 125 mm Length to Outside of Rings 4.921" / 125 mm Overall Mount Length 3.937" / 100 mm Length Between Nuts/Levers With several new models released by ERATAC in 2017, Short-Version One-Piece Mounts are suitable for use with any bolt action or AR10-type rifle. Fully-machined from solid, high-grade aluminum All parts are Mil-spec, Type-III anodized (black), rendering them corrosion-proof Available for 30-, 34-, and 36-mm scope tubes MPN series T10xx secure with safety levers MPN series T20xx secure with nuts All versions available in 0- and 20-MOA inclination. ERA-TAC ERATAC One-Piece Mount 36mm 20 MOA 31mm Levers T1016-2031