0.3-3.2mm

1.Can be used on small electric grinder or flexible shaft.

2.The meaning of connection size M7x0.75 or M8x0.75 : 7/8 refers to the small grinding machine shaft outer diameter is 7mm/8mm, 0.75 is screw thread pitch 0.75mm.

3.M8x0.75mm chuck can be equipped with electric grinder and  flexible shaft output shaft diameter of 7.9mm,while M7x 0.75mm fite for output shaft diameter of 6.9mm.

4.Chuck of 9/32"-40 refers to the machine shaft outer diameter is 9/32", and the screw thread is 40 teeth per inch.

5.This multi chuck allows you to quickly and easily change accessories on your electric grinder.

6.Three - jaw head design, can be clamped varies range,and grip tiny drill bits tightly.

7.Rust-resistant black oxide finish.