1、[Firm Clamping] This round die chuck is precisely manufactured, has high mechanical performance, will provide firm and stable clamping. 2、[Standard Size] This chuck is standard in size, the outer diameter of the interface is 31mm, and the maximum thread depth is 70mm. 3、[Carbon Steel Material] This chuck is made of carbon steel, quenched and blacked, has strong oxidation resistance, high hardness and long life. 4、[Simple Installation] This chuck allows quick and easy installation and removal, saves you a lot of time when switching between applications. 5、[Multi Purpose] This die chuck can be widely used in tapping machine, drilling machine, milling machine, boring machine, pneumatic tool, etc. 1 x Round Die Chuck1 x Hex Wrench Item Type: Round Die ChuckMaterial: Carbon SteelInterface Outer Diameter: Approx. 31mm/ 1.2inMaximum Thread Depth: Approx. 70mm/ 2.8in