These billet mounts are excellent for mounting your 4 3/8 co2 bottles. These are for most typical 2.5lb bottles including the ones used in our extremely popular co2 kits. The mounts secure to cage bar with 2 hex head screws and bottle is secured in clamp with quick release knob. Available for 1.0, 1.5, 1.625 and 1.75 bar. Anodized black for good looks.