Main features:
1.The material: Allyed case hardened steel, black-finished and precisely grinded
2.Taper tolerance: AT3 Standard
3.Hardness: 50-55HRC
4.Run out: 0.005mm
5.Coolant: AD, ADB, B type
6.Surface: blacken, sand blasting, plating
7.Dynamic balancing : G2.5/25000rpm