Gas cylinder cap, Amercia type Size: 3-1/2 x8, 3-1/2 x 11; 3-1/8 x 7, 3-1/8 x 11 Plastic powder painting 1) USAGE: TO PROTECT THE CYLINDER VALVE2) SIZE AVAILABLE: W80-11, W95-11, 3-1/2 X8, 3-1/2 X11, 3-1/8 X7, 3-1/8 X113) SURFACE: PLASTIC POWDER COATING, GALVANIZED4) PACKING: EACH PC WRAPPED BY PAPER, 24PCS/CTN5) MATERIAL: STEEL oxygen cylinder cap