Set Includes 70 / 20 Degree Bore Cutter : 1 ¼”, 1 ½” 30 Degree : 1 ¾” 45 Degree : 1 3/16”, 1 ¼”, 1 5/16” ,1 7/16”, 1 ½”, 1 ⅝”,1 ¾” 8 Pilots / Guides / Stems Sizes : 7mm, 8mm, 8.5mm, 9mm, 10mm, 5/16”, 7/16”, 11/32”. Praztech Engineering Engine Repair Tool Handy for home mechanics This type of seat cutter will work on non hardened seats