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