... of world top production technology, such as electro-hydraulic forging hammer, seal chamber furnace lines, precision machine tools and so on ... / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm,42mm,44mmThread Drill Bits---Diameter: 51mm to 127mmThread Type---R22,R25 ... The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM /90MM /110MM 3) Face ShapeConvex---Suitable for soft rock ...