? Service & Note: contact us with any question. Problem will be solved in 24h. NOTE: please read instruction carefully before use to avoid any accident. KEEP SAFE then enjoy your nail art!. ? ERGONOMIC DESIGN: this nail drill machine consists of 2 parts, main machine and light weight drill pen. ? EASY & SAFE: easy to use rotate speed control, set direction and to change bits. Automatic OFF to protect itself from overheating. ? SPEED ADJUSTABLE: the speed of nail drill machine can be adjusted from 2,000rpm up to 20,000rpm. The file can rotate in different directions with operation switch. ? MULTI-USE: works for natural as well as artificial nails. Designed for grinding, cutting, carving, polishing for nail art, dead skin, thick fungal nails, ect.