This DeckMate Drop-In Storage Box helps you need to turn our 28" bench base into a clean storage location for your boat. Offers a 7 Gallon storage capacity  This product will fit in any of our standard 28" pontoon boat bench bases.  Select the 38"  or 55" drop in option if you are wanting to use this on a 38" or 55" bench. Inside dimensions of the 28" drop in are 20-7/8" wide and 8-1/8" deep. This is excluding the lip around the edge for the inside dimensions. Actual 28", 38" or 55" bench seat is sold separately