31 PCS VALVE SEAT CUTTER SET HIGH CARBON STEEL 21 CTR + 8 STEMS +2 ARBR+ RODS. VALVE SEAT TOOL KIT. HIGH CARBON STEEL CUTTER. VINTAGE BLOCK HEADS HQ. Milling in the following sizes. At 45 DEGREE + 90 DEGREE. 2-1/8 – 45 DEG. At 30 DEGREE + 60 DEGREE. 2 – 30 DEG. 2-1/8 – 30 DEG. SEAT BORE CUTTERS 70 DEG. 8 stem guide in the following sizes. 4x 5/16″, 3/8″, 11/32″, 7/16″. 4x 6 MM, 7 MM, 9 MM, 10 MM. Not suitable for Modern / Hardened valve seats. Note: This item comes in loose packaging.