Flush Mount Combo Drink Holder with Drain Fitting – Stamped 304 Stainless SteelFlush 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.Specifications:Hole Required: 3-5\/8"