Advantage:
1.double helix with coolant
2.Hardness:HRC40-45
3.high strength
4.Mached Zccct and taegutec insert.
5.It have enough stock.
6.If buy 200pcs insert,then you can get 1pcs U drill for free.
Welcome to your trail order to test our quality and service!
Contacts:Miss.Letitia



