... and hard stratum. 2.Max Depth 80m 3.Drilling Rig dia 0.8m-2.0m 3.Sell well on ... foreign markets 1. Uses CZF drilling rig is specializedly used for pore forming of pebble ... to drain slag,which not only resolves the drilling difficulty in special stratum such as pebble ... Usability Stable,safe,reliable and competitive price. The drilling tower adopts hydraulic pressure uprising,and reduces the ...