Standard 2-Pc Base, Black Matte Description Leupold Standard 2-piece base fits: CA 22 Cooper Arms Black Matte Leupold's tradition of quality goes beyond riflescopes. Because for decades they have engineered and manufactured mounting systems in their Oregon plant that are as rugged and reliable as the Leupold scopes they secure. These mounts are made of solid 12L14 cold rolled bar stock, using the latest CNC (computer numerical controlled) machining tools. Tolerances are held to as little as 3/10,000 of an inch. The revolutionary Torx drive system has a deep-engaging lobe design that will not strip screw heads or distort drivers. As a result, it's the only drive system capable of delivering all the torque necessary to properly seat mounting screws. Torx screws and a Torx driver are included with every Leupold scope mounting system.