... the hole hammer,DTH bits, drilling for blast hole,drilling hole for wire cutting,drilling rig Technical parameter of Down ... hammer, DTH bits, drilling for blast hole, drilling hole for wire, drilling rig, drill, driller, rock drilling machine ModelDT-DTH90-PDT ... /Electric DrillerPneumatic/Hydraulic DrillerMax.depth of drilling30m20m30mdiameter of drillingΦ90-100mmΦ65-90mmΦ90-100mmDrilling speed5-8m/ ...