Fits 2 diameter 10-ounce CO2 bottle. For flat mount application only - will not accept Pro-werks Bar Mount. Lightweight mount has two 1/4Ó-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 # C72-101 listed at right and necessary Bar Mount listed on page 2.