... drilling tools, eccentric drilling tools, standardized API system casings, bit shanks and casing tubes which are fit for hydraulic drilling ... of world top production technology, such as electro-hydraulic forging hammer, seal chamber furnace lines, precision machine tools and so ... R38,T38,T45,T51Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM /90MM /110MM 3) Face ShapeConvex--- ...