Size: This V-band clamp kit connects two 3.0" OD pipes through flanges. The T-bolt thread size is M8×1.25 Advantage：V-band clamp is easy to install and remove perfect for applications requiring frequent removals and provide a great seal with even pressure at the flange Feature：V band flanges are sealed without gaskets. Professional welding process is recommended Material：Stainless steel clamp; mild steel flanges and chromium-molybdenum steel T bolt Application：Compatible for exhaust system, turbocharger, downpipe, muffler etc EVIL ENERGY is our brand,we're a direct and professional manufaturer in China,one of greatest manufacturer and exporter in Tuning parts include intake system,exhaust system,engine system,cooling system,interior&exterior parts. Accept customized order with minimum quantity. V-Band Flange Assemblies are a popular and effective alternative to traditional flanged or slip fit tube connections.They work very well in operating conditions involving stress, vibration and extreme temperature fluctuations. The V-band flanges are machined to allow them to slide about 1/8" onto the pipe before welding which keeps them centered and ensures a smooth transition for exhaust flow. Fit perfectly, nice and snug. Welded up cleanly. No leaks. It can be used for Catback Axleback Turboback DPFBack Downpipe Intermediate Pipes. Flange ID size 2.25" 2.25" (2 1/4), Clamp size will bigger than 2.25"2.25" (2 1/4), make sure the size right . Measure before purchasing .