UNIVERSAL VBAND CLAMP KIT Features and Benefits: 3.5 inch I.D (internal flange diameter) pipe slips in 4.0 inch O.D (outer flange diameter) pipe sits over X1 Stainless Steel VBAND CLAMP X2 Stainless Steel Flanges These are used in various number of exhaust applications, particularly turbocharged vehicles. Where room is either limited, or ease of removal is required as well. This makes removing dump pipe or exhaust system, much easier than ever before. Can also be used in other desired applications. Designed for efficient sealing Used to create joints that eliminate heavy, bolted flange connections Eases installation Eases maintenance Manufactured from high grade stainless steel, designed for quick and easy install and removal and to maximize space.