You do not need to use a chuck key, pin, or wrench. There is a quick-release mechanism on the handpiece body that allows for easy and smooth opening. This item features low vibration and slow heat buildup during operation. Suitable for grinding, drilling, milling, and other compatible applications. Made of high-quality metal material with a durable surface finish. Compact design for comfortable and precise handling. Commonly used in jewelry and craft processing. Color: Silver + Black Material: Metal Length: 14.2 cm Collet: 2.35 mm Package Contents: 1 x Flex Shaft Machine Note: Other items are not included. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error is +/- 1-3 cm.