Features: Thischuck is easy to use and install, allowing quick and easy power tool bit change.Madeof high quality metal material, it is strong and durable, rust-resistant.1/4hex shank is suitable for most power tools such as electric drill, grinder, screwdriver. Largecapacity, it can be used for bits of diameter from 0.3mm to 6.5mm.Easily lock and release bit in a short time, practicalto use. Specifications: Condition: 100% Brand NewMaterial: MetalColor: BlackHex Shank: 1/4" (6.35mm)Capacity: 0.3-6.5mm Overall Size: approx:7.5*3.5cm/2.95*1.38inWeight: approx. 80g Package Includes: 1 * 1/4 Chuck Note:1. 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.2. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding.