Material:
A Grade
AA Grade
Features:
Use the high carbon bearing steel , heat treated rigidity is HRC48°-50°
The surfaco roughness is below RZ2.5, has two classes' products.
The inner bore processing by high precision grinding according to DIN standard.
Use for clamping screw tap, drill , milling cutter, reamer and so on.
Having tension and compression function, brilliant and changeable.