FX Series offers ergonomic handpieces that are functional and reliable. Simple technology with a durable, modern design. High-precision gear system operates quietly with low vibration. Push-button chuck allows simple, one-touch bur insertion and removal without the need for a chuck tool. Specifications Gear Ratio: 1:1 Direct Drive For: FG Burs (Ø1.6) Body Material: Aluminum Max Speed: 40,000 min-1 Features Clean Head System Push Button Chuck Ball Bearings Compatible with KaVo INTRA™ 181K Air Motor