Hose Coupling, Made of Nylon, Durable and Lightweight, Suitable for Various Size Blast Hose Material: nylonDurable and lightweightUse for following blast hose sizesInner diameter: 25 and 32mm/1 and 1-1/4-inchOuter diameter: 39, 48, 51 and 55mm/1-1/2, 1-7/8, 2 and 2-5/32-inch