Description:

Outer diameter (OD): 8mm / 0.31"; inner diameter: 6.35mm / 1/4"; total length: 25mm / 0.98". Made of carbon steel for high hardness and strength. Black oxide finish for corrosion and wear resistance.. Suitable for engraving machine, CNC machine and wood router chuck conversion.. Provide precision, tight and stable clamping force for work efficiency.. Easy to use. Just slide the adapter into your collet and tighten..