ITEM NAME:Motor shaft Collet Chuck ER20 A 16mm Extension Rod Holder tool holder CNC M D5Q9 Motor shaft Collet Chuck ER20 A 16mm Extension Rod Holder tool holder CNC M D5Q9 Type: ER20A nut Length: Handle body length 50mm, total length containing nuts 60mm Shaft hole: 16mm (-0.02mm) the need to install heating expansion Material: 40RC Usage: The motor shaft extension rod sleeve on the motor shaft, and both sides of the screw is tightened. Color: black,silver Package included: 1 X ER20 A-16mm Motor shaft tool holder Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..1 X ER20 A-16mm Motor shaft tool holder. Shaft hole: 16mm (-0.02mm) the need to install heating expansion. Usage: The motor shaft extension rod sleeve on the motor shaft, and both sides of the screw is tightened.