This #8 Stainless Stainless Steel Hose Clamp fits hose inside diameter (I.D.) 3/8" and 1/2". The clamp's outside diameter (O.D.) ranges from 1/2" – 1". Generally used in small diameter applications such as air, fuel and water lines, this clamp is manufactured with a 1/2" stainless steel band and stainless steel hex screw.