... , nonferrous metal mine etc. Two drilling booms, Self-return. ZQST-40/3.0 Pneumatic Coal Borer ID ITEMUNITPARAMETER1 Driller diameter mm ... consumption with loadL/S506Hose sizemmΦ197Weightkg88Our used pressureMpa0.501) ZQST-40/3.0 Pneumatic explosion-proof drilling machine is used in ... .2)Wet drilling and dry drilling are both applicable. ZQST-40/3.0 Pneumatic Coal Borer