VALVE SEAT TOOL KIT 31 PCS HIGH CARBON STEEL CUTTER. VINTAGE BLOCK HEADS HQ. At 45 DEGREE + 90 DEGREE. At 30 DEGREE + 60 DEGREE. SEAT BORE CUTTERS 70°. 8 stem guide in the following sizes. 5/16″, 3/8″, 11/32″, 7/16″. 7MM, 8.5MM, 9MM, 10MM. Not suitable for Modern / Hardened valve seats. NOW IN VINTAGE STYLE METAL CASE. VALVE SEAT TOOL KIT 31 PCS HIGH CARBON STEEL CUTTER VINTAGE BLOCK HEADS HQ Description & Contents at 45 DEGREE + 90 DEGREE: 1-7/8″ – 45° 1-3/4″ – 45° 1-5/8″ – 45° 1-9/16″ – 45° 1-1/2″ – 45° 1-7/16″ – 45° 1-5/16″ – 45° 1-3/16″ – 45° at 30 DEGREE + 60 DEGREE: SEAT BORE CUTTERS 70° 8 stem guide in the following sizes: 5/16″, 3/8″, 11/32″, 7/16″, 7MM, 8.5MM, 9MM, 10MM.