SeaLux (2pcs) Stainless Steel Recessed Cup Drink Holder for Marine Boat RV Camper Made of 304 stainless steel for supreme corrosion resistance Includes drain with hose barb, mounting gasket and internal pad Dimensions:Height overall including drain fitting - 4"; Diameter overall lip outside (flange) - 4-1/4" ;Height overall excluding drain fitting - 3-1/4" ; 4" H - 3 1/2"ID, 4 1/4" OD, with flange Replaces plastic drop-in cup holders with ease. Diameter inside (large) - 3-5/8";Diameter inside (small) - 2-5/8";Hole cutout needed - 3-3/4"