Fits 2" diameter 10-ounce CO2 bottle. For flat mount application only - will not accept Pro-werks Bar Mount. Lightweight mount has two 1/4"-20 threaded mount holes with 1-1/2" spacing, measures 3/8" thick. It is recommended to use two mounts per bottle. If bar mountable version is required, order part number C72-101 and necessary Bar Mount.