... )Professional equipment for processing of steel structure connection, the max drilling-hole diameter 50mm2)12 high speed hydraulic clamps.one ... circuiation cooling5CNC,PLC control,CRT display,easy for program and convenience for preview,machine is compositive design,no need ... measure0.15—0.50mm/minRotating range110—180(stepless speed regulation)rpmDrill speed16~25mm/minHydraulic clamps(Clamp number):12 ...