... , the second one is four rows boring, it can fulfill full automatic loading, stacking, and boring ... data:host 6 rows in the front drill, and 4 rows in the back drill processing dimensions800*2400mmspeed8times ... boring distance1800mmMin. vertical boring distance135mmrotation speed of the boring head2800(50Hz)working pneumatic power6-8kg/m ... KB407/6 rows in the front drill, and 4 rows in the back drill