12PCS: 1# M3-6: 1.4-3.6MM; 1,8MM DRILL / 2# M6-8: 2.1-4.9MM; 2,6MM DRILL / 3# M8-11: 3.1-6.5MM; 3,7MM DRILL / 4# M11-14: 4.8-8.8MM; 5,5MM DRILL / 5# M14-18: 6.2-11MM; 7,0MM DRILL / 6# M18-24: 9.4-15; 10,3MM DRILL; MATERIAL: HSS; STAMPING OF SIZE # ON EACH PART