* High accuracy realization excellent run out and inside close slit processing by exact grinding can keep long accuracy without damage of tool shank
* High hardness preservation strengthen thickness of the body and heightens handing & power by spiral slit processing
* Insert external cover & internal oil ring which produce protect from inflow incoming controll create extention inside keep up precision and incrase life of holder
* Minimum 85% taper contact is guaranteed
* Holder's accuracy ensure which reduce damage of machine spins