Mild steel Weld Flange, V-band- Machined, mates to industry standard 5" V-band flanges and use 5" standard V-band clamp (actualy outer ring is around 5.25") to join two of these flanges. Also mates to most standard turbine housings with 5" v-band (5.25" outer ring) turbine outlet flange such as ones found on the T6 flanged GT47 and GT55