... 2.High penetrability. 3.Can match many famous drilling machine, such as Atlas Copco, Sandvik, In We are ... hydraulic forging hammer, seal chamber furnace lines, precision machine tools and so on. We adopt numerical control process ... Tapered Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm,42mm, ... H19/H22, Diameter---20mm - 42mm. T51 Thread button bits