Chuck: Alloy Steel

Shank: Carbon Steel

0.3-3.4mm   (0.3-4mm, 0.3-6.5mm are Available)

3mm Round Shank   (2.35mm is Available)

1.Three - jaw head design, grips extra-fine bits from 0.3mm up to 3.4mm; This also holds many rotary tool accessories well.

2.Keyless chuck finger-tightens for easy bit changes - no chuck key needed.

3.Available in electric grinder, nail machine, engraving machine.

4.Unique torque thrust bearing is easy to handle applied translate into greater clamping force.

5.Before using please 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.