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