... 94Weightkg22B,ZQSJ-90/2.4 Portable Pneumatic Flame-proof Drilling Machine detailed illustration,C,ZQSJ-90/2.4 Portable ... operation4.Maintenance convenience5.High drilling efficiencyZQSJ-90/2.4Potable Pneumatic Flame-proof Drilling Machine is used in drilling holes for exploring, ... It is also the ideal equipment instead of electric drilling machine for water and gas discharging under mine. D.Ruilong ...