Features 1、Fast Changing: Ensuring fast change for installation and disassembly, the thread die chuck will largely save time and improve efficiency. 2、Broad in Using: Widely applied in tapping machines, drilling machines, milling machines, boring machines, pneumatic tools, and so on. 3、Better Designs: Designed to have 31mm outer diameter and 90mm maximum collet depth, the threading die ensures perfect match on machine. 4、Great Material: Adopting premium carbon steel material with high hardness, which has great durability against corrosion and long use. 5、Easy to Install: Comes with a light weight and a compact size as well, the convenient installation can be quickly finished in minutes. Specification Item Type: Thread Die Chuck Model: TC820 M16 M20 Material: Carbon Steel Interface Outer Diameter: Approx. 31mm / 1.22in Maximum Collet Depth: Approx. 90mm / 3.54in Package List 1 x Thread Die Chuck 1 x Hex Wrench