Billet Aluminum Neck Mounts Ideal for Fire Suppression and Cylinder Mounting Beautifully micro-polished aluminum Neck Mounts may be direct flat mounted or accept the popular Pro-werks Bar Mount for clamping on round tubing. Provides mounting of Fire Extinguisher cylinders when clamping on the neck portion is required. Designed to be used with the correponding size of Pro-werks Bottle Mounts. May be direct mounted on tabs, a flat surface, or accepts the popular Pro-werks Bar Mounts for clamping on round tubing. The base has two 1/4"-20 NC threaded mount holes with 2-5/8" spacing and measures 1/2" thick. Compatible Bottle Sizes 3.55" Diameter 4" Diameter 4-1/4" Diameter 5-1/4" Diameter All of the Pro-werks 360° Secure components are machined with pride right here in Michigan. We start with U.S. melt, aircraft-grade 6061-T6 aluminum billets, run them through our MAZAK precision CNC machines, and then detail them to a jewelry-quality finish. Backed by The Chassis Shop's Satisfaction Guarantee. This is one of the original Pro-werks product groups! Complete Your Build Pair your mounts with these related components from The Chassis Shop: Fill Caps & Bungs — for fuel cells, tanks, and custom fabrication Cables & Cable Hardware — for CO2 bottle triggers, electrical disconnects, and parachute releases Access Door Kits — for quick access to bottles and components behind body panels Proudly Made in the USA