This lightweight cantilever mount elevates MAG/RMS-C footprint red dot sights to 1/3 lower co-witness height on 21 mm Weaver rails. Made from durable polymer with a matte-black finish, it offers a saddle height of 28 mm and a rail length of 36 mm. The mounting plate measures 40.8 mm by 23 mm. Weight: 23 g.