Adopt high quality spring steel material,good flexibility and wear resistance.

Extra long life

High precision ,tight and stable clamping.

Work with 6mm Collet ,such as drills ,boring knife,engraver, reamer etc.

Help to adjust the shank of the CNC engraving bits from 6.35mm to 3.175mm.

Total length: 23mm

Diameter(Outer): 6.35mm

Diameter(Inner): 3.175mm