This is a Motor Shaft Extension Rod Tool Holder Collet Chucks for DIY CNC 3 Axis Engraver Machine PCB Milling Wood Carving Router Kit Arduino Grbl.

It contains two parts, an ER11-A 5mm extension rod and a collet chuck. It has very high accuracy and convenient operation. Use high-quality carbon steel, after heat treatment, has good flexibility and abrasion resistance. The clamping force and

good gripping stability can effectively reduce the vibration generated at work. It can be for gripping the drill, boring knife, chisel, reamers and other tools.