... torque 5.Maintenance convenience A, ZQS-50/1.6Portable Pneumatic Drilling Machine is introduced, Basic performance unit Basic performance ... 90/2.4 Portable Pneumatic Drilling Machine detailed illustration,C,ZQS-50/1.6Portable Pneumatic Drilling Machineproduct features and ... -proof4.Great torque5.Maintenance convenienceZQS-50/1.6 portable pneumatic drilling machine has nine main features:more powerful, ...