Features 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. Manganese Steel: The Drill Chuck Arbor Is Made of Excellent Manganese Steel With Blackening Surface And High Resistance to Oxidation. 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