1、WIDE CLAMPING RANGE: 3 to 16mm (1/8in to 5/8in), MT5 shank. With an accuracy of 0.003in to 0.005in, this self tightening keyless drill chuck offers extremely high accuracy design, making it suitable for CNC machines and machining centers. 2、ALLOY STEEL MATERIAL: Made from premium 40cr alloy steel, this drill chuck has excellent wear resistance and stable performance. It undergoes quenching and hardening to achieve high concentricity, improved hardness, and good overall mechanical properties. The surface is finely polished for an aesthetic appearance, while the bore holes are processed with accuracy grinding, ensuring high centering accuracy. 3、VERSATILE USAGE: Mainly used for drilling on drilling and milling machines, this drill chuck provides better clamping capacity and higher accuracy than ordinary drill chucks. It offers the convenience of easy installation and removal of drill bits. 4、ENHANCED EFFICIENCY: The self tightening feature eliminates the need for a chuck key, saving valuable time and effort. Quick and convenient tool changes improve work efficiency, making it ideal for professional use. 5、DEPENDABLE PERFORMANCE: With its high accuracy, stability, and durability, this self tightening keyless drill chuck is a dependable tool that ensures consistent and accurate drilling operations, contributing to the overall productivity and quality of machining processes.