Features 1、Adopt carburizing and quenching process, high surface hardness and high wear resistance 2、Flexible clamping with three jaws for greater clamping range 3、Suitable for holding drill bits between 1-16 which is stable and firm 4、Simple structure, convenient to load and unload, and longer service life 5、Can maintain the toughness of the core after low-carbon quenching, so that the tool holder can withstand a certain impact and load Specification Item Type: Drill Chuck Tool Holder Material: High speed steel Model: BT40-APU16-100 Applicable Machine Tools: CNC, CNC milling machine, high speed machine Processing Range: APU Hardness: HRC56 Clamping: 1-16 Carburizing and Quenching Hardness: ≤HRC56 Carburizing Depth: ＞0.8mm Package List 1 x Drill Chuck Tool Holder