1.Integrated structure. 2.casting surface,contribute to the reduction of blow force 3.large capacity of production 4.durable    steel heat treatment, structure, increase the strength and durability.  all kinds of drill bit are available  we have our owner...

1.high precision punch and chisel 2.quenched hardening treatment. 3.sharp and durabel 4.stainless steel    1.  Integrated structure.   2. Steel heat treatment, structure, increase the strength and durability.   3.   Improvement of...