The M-163-B clamp will hold a 4.58" diameter bottle. Mounting holes in the clamp are 1/4" - 20 (uses bolt # 48CBH) on 3.610" centers. Used in fresh air bottle applications such as Simpson air bottles which has the spun fiberglass around the bottle.Machined out of 1/2" 6061 aluminum. See our tab assortment to find an appropriate mounting tab.