Feature: 1. Good heat dissipation effect and can be used for a long time. High‑quality accessories, with good structure. 2. The polishing handle very quiet and smooth, with slight vibration, and the chuck handle can be locked/unlocked, safer operation, high efficency. 3. Do not move the polishing head lock catch of the handpiece during operation; do not cover the vent on the handpiece during use. 4. Rotating speed is adjustable in 0‑35000rpm, support forward/reverse direction, super fast; birng you effective manicure experience. 5. Ergonomic handle design, comfortable to hold, easy to use, sturdy and durable.You can easily replace nail drill bit without tools. Specification: Condition: Brand New Item Type: Nail Drill Handle Material: Aluminum Alloy Speed: 35000rpm Size: Approx. 14 x 2.3cm / 5.5 x 0.9inInner diameter of the interface: 2.1mm Output DC voltage: 12V. Package List: 1 x Nail Drill Handpiece Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.4.Product interface for DC5521 model, suitable for most of the nail polishers on the market, please confirm the interface is applicable before purchase.