Flush Mount Combo Drink Holders with Drain Fittings feature a dual-purpose design that allows the use of beverage cans with or without insulated can wraps, as well as most standard size bottles. Integral drain fitting allows water to be drained directly into the bilge with the use of 1/4" tubing (not included). Requires a 3-5/8" diameter hole for installation. The bottom is padded with a rubber insert to prevent rattling. Includes mounting gasket. Constructed of corrosion resistant stamped 304 stainless steel.