die insert

Piercing punch and die insert
1,Material:SKH 51,Hardness: HRC61-64
2.Material:Carbide，Hardness:HRC67~
3.Material:HAP 40，Hardness:64-67 HRC
Up to precision 0.003mm,with roundess and concentricity ￠ 0.002mm,
Unilateral fit clerance 0.005mm