2Pc 2.5" T-Bolt Clamp Silicone Stainless Steel Hose Turbo Intake Intercooler P1 for Mazda 2 Made from high quality stainless steel. Clamps are 2.5"(63mm) inner diameter. T-bolt band is 3/4" (19mm). To ensure a proper fit the thickness of the silicone hose should be 4mm or more. Useful on many different applications like radiator hoses and intake systems.