1)About the drill bit, the cutting depth includes: 30mm , 55mm , 75mm , 110mm. 2)Material:M35 M42 M2 9341. We can supply drill ... cutters1)Max.drilling depth:30mm/55mm/75mm/110mm2)Material:HSS9341, M2,M35,M423)Diameter: from12mm to 100mm4)Use: widely used in ... much better and quicker than the common drill bits. drill bit