1Scope of use: air conditioning drilling, wall drilling coring, range hood drilling, engineering bridge drilling, construction drilling coring, machine room pipe, etc 2Standard hex joint, high quality screw hole interface, convenient for loading and unloading drill bits 3High strength seamless steel tube substrate with high hardness, not easy to deformation,and wear-resistant 4Sharp edge, thick diamond, wear - resistant, sharp, and not easy to defect 5Fast drilling , sharp and tough, labor - saving safety, high stability
