Description: Adjustable speed to effectively treat both delicate areas and rough callus Quiet and Smooth. Light-weight design for precise operation. Portable and Easy to carry out Multi use: carving, engraving, routing, grinding, sharpening, sanding, polishing, drilling and so on The nail drill can be used for natural nails as well as artificial nails Suitable for Professional salon, Studio or Home Use Specification: Collets type: 2.4mm Voltage: AC 100-220V Plug Type: US Plug Variable speed control: 18000 RPM up to 20,000 RPM Color: Blue Dimension: 158mm x 30mm Operation: Unplug the tool form electric outlet before loading a bit Press shaft lock button, use the collet wrench to loosen the collet nut. Insert the bit, and tighten the collet securely,. But avoid excess tightening of the collet nut and never use the damaged bit. There is an off/on switch. When the switch is on, the tool runs at 20,000rpm. There is a switch indicator with an orange line on it. Slide the switch to find the speed needed form 18000 to 20000rpm. Slide the switch to black dot for complete stop. When finished, turn off the tool and unplug it Package Includes: 1 x Electric nail drill machine 1 x AC adapter 6 x Bits (5 bits, 1 emery rod with 6 sanding bands) 1 x User manual