Engraving Bit Tool Adapter 6mm to 4mm

Feature: Engraving Bit CNC Router Tool Adapter after heat treatment and precision grinding,fine grinding,concerted and high precision size; suitable for engraving machine ER collet Quality steel production,heat treatment, has good flexibility and abrasion resistance Clamping force,high accuracy,good gripping stability Commonly used in the engraving machine spindle motor folder knife, with the engraving machine collets use