Available in electric grinder， nail machine， engraving machine
Adjust the speed of the first governor to the lowest or zero turn， And then turn on the power to adjust speed， but speed is not too high . Best not to over 10，000 rpm， otherwise it will cause the rear axle bent.

Specification:
Color: Black/Silver
Material: Carbon Steel
Hardness: 43HRC
Drill Chuck Dia:0.3-4mm
Chuck height: 18.6mm
Chuck diameter: 13mm
Thread Size: M6 * 0.75
Connecting Rod Shank 2.3mm and 3mm

Package Included:
2 x 0.3-4mm Keyless Drill Chuck(one black one silver)
2 x 3mm Connecting Rod