It Made of CNC, 6061-T6 aircraft grade aluminum, not easy to scratch, strong durability.
Made from aluminum 1-piece clamp halves that have the rail formed into the clamp With Rubber Pads.
The contact surface between the fixture and the extension tube is protected by rubber pads, prevent damage.
Installation Compatible with: Remington 870, 1100, 1187;Benelli M4, M2(except SuperNova); Mossberg 500/590A1, 590/590S, 12ga, 20" 8 rd, 590m, Mossbewrg 930 spx, 940, maverick 88; Winchester 1300, 1200 and SXP Defender, Beretta 1301, Some Semi-auto models of Derya, Stoeger M3000/M3500