Rev9Power Rev9_AC-059; V-Band Clamp & Flange Kit(4.0 Inch) Product Details 4" stainless steel V-band flange and V-band clamp "- come with male and female adaptor - newly designed clamp fastener means extra security - 2.2mm wall thickness - 4" inner diameter flange - high quality stainless steel - perfect high horsepower turbo application