hollow drilling is a new type of drilling tools,which support Magnetic Drill Block,the large steel components can be anywhere drilling,efficiency is Twist Drill-10 times,can be controlled in the 0-0.05mm tolerance,but also a reaming,drilling half hole,ramps,and other unique features of faces.
Widely used in railways,bridges,ship building,boilers,machinery manufacturing,environmental protection,oil and gas pipline industries.