Features Manganese Steel: The drill chuck arbor is made of excellent manganese steel with blackening surface and high resistance to oxidation. High Hardness: The drill chuck arbor has high hardness and longer service life. The thread size is 1/2in, 20mm long and the connecting rod is R8. Connection Method: The drill chuck arbor is connected by screw connection, so that you can have easy operation and use in the actual process. Quick and Easy Installation: The drill chuck arbor allows for quick and simple installation and removal, saving you time when switching between applications. Wide Application: This 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 Thread Size: 1/2in, 20mm long, Approx. 20mm / 0.8in Connecting Rod: R8 Connection Method: Screw Package List:1 x Threaded Drill Chuck Arbor Package List 1 x Threaded Drill Chuck Arbor