1、High Hardness and Stable: The threaded milling drill chuck arbor has high hardness and longer service life. MT3 Shank to 3/8in‑24. 2、Connection Way: This drill chuck arbor is connected by screw connection, so that you can have simple operation and use in the actual process. 3、Made of Manganese Steel: The threaded drill chuck arbor is made of excellent manganese steel with blackening face and high resistance to oxidation. 4、Easy Installation: This drill chuck arbor allows for quick and easy installation and removal, saving you time when switching between applications. 5、Wide Use: Our high accuracy drill chuck arbor is widely used in tapping machines, drilling machines, milling machines, boring machines, pneumatic tools, etc.