1Available in electric grinder, nail machine, engraving machine 2Adjust 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 , otherwise it will cause the rear axle bent. 3Keyless chuck finger-tightens for easy bit changes. 4Use aluminum alloy and carbon steel material, durable in use 5Electric grinder parts, convenience to replace the broken one
