Flange diameter: 2.75 "70mm. Flange and clamp made of 304 stainless steel. For turbo and exhaust applications. Dimensions: Inner diameter: 70mm Outer diameter (welding side): 78mm Outer diameter (band side): 88mm Flange diameter: 2.75 "70mm Flap and clamp made of 304 stainless steel. For turbo and exhaust system applications.