Plumber's Choice 78015 3-1/16-Inch to 4-Inch Marine Grade No.56 Hose Clamp for 3-1/2-Inch Internal Diameter Hose (10-Pack) For 3-1/2-inch internal diameter hose Made from 100% stainless steel For marine or underground use 300 Series stainless steel band and housing; 305 Grade stainless steel; Slotted hex head screw Box of 10