THE MAVEN PERFORMANCE BILLET STEEL TURBO MOUNT SUPPORTS THE TURBO FROM THE BEARING HOUSING AT THE DRAIN INTERFACE. FEATURES: Large Frame 175-C02 DESIGNED & MACHINED IN THE USA BILLET COLD ROLLED STEEL (CRS) 2 DIFFERENT TUBE DIAMETER POCKETS- 1.125″ & 1.25″ CENTER MOUNTING ON BEARING HOUSING -12 ORB/AN DRAIN O-RING SEAL- NO GASKET REQUIRED BEARING HOUSING CAN PIVOT 360 DEG W/O INTERFERENCE WEIGHS JUST 18 oz MEASURES 4″L 1.75W 1.4H GEN1 PRECISION PRO MODS WITH T6 FLANGE, BORG WARNER S500 series ETC FEATURES: Mid Frame 175-B10 & 175-B12 DESIGNED & MACHINED IN THE USA BILLET COLD ROLLED STEEL (CRS) 2 DIFFERENT TUBE DIAMETER POCKETS- 1″ & 1.125″ CENTER MOUNTING ON BEARING HOUSING -10 or -12 ORB/AN DRAIN O-RING SEAL- NO GASKET REQUIRED BEARING HOUSING CAN PIVOT 360 DEG W/O INTERFERENCE WEIGHS JUST 16 oz MEASURES 4.4″L 1.4W 1.25H FEATURES: Small Frame 175-B15 and 175-A03 DESIGNED & MACHINED IN THE USA BILLET COLD ROLLED STEEL (CRS) 2 DIFFERENT TUBE DIAMETER POCKETS- 7/8" & 1″ CENTER MOUNTING ON BEARING HOUSING -10 ORB/AN DRAIN (-8 ORB/AN on the "B15" GT 1.5") O-RING SEAL for 2.0 "A03", Standard Gasket for 1.5" "B15" BEARING HOUSING CAN PIVOT 360 DEG W/O INTERFERENCE WEIGHS JUST 9.5 oz MEASURES 3.75″L 1.35W 1.125H