... the hole hammer,DTH bits, drilling for blast hole,drilling hole for wire cutting,drilling rig Technical parameter of Down The Hole ... the hole hammer, DTH bits, drilling for blast hole, drilling hole for wire, drilling rig, drill, driller, rock drilling machine ModelDT-DTH90-PDT-DTH90- ... drillingΦ90-100mmΦ65-90mmΦ90-100mmDrilling speed5-8m/h5-8m/h5-8m/hMinimum air pressure0.5-0.7MPa0.5-0.7MPa0.5 ...