The Nitrous Express 1 pound and 1.25 pounds billet bottle bracket is designed to securely hold your nitrous bottle at the proper angle for maximum flow through the siphon tube. The bottle bracket has a 3.2 inch diameter and are made of stainless steel and feature a quick-release, wrenchless design that can be mounted in any position. The brackets are available for any sized Nitrous Express nitrous bottles. Bar mount for the bottle bracket is required.