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 fast and smooth opening. This item features low vibration and slow heating during operation. Suitable for grinding, drilling, milling, and other compatible applications. Made of high-quality metal material with a smooth surface. Compact design for comfortable and convenient use. 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 not included. Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement allows an error of +/- 1-3 cm.