Features Standard Size: The Drill Chuck Arbor Has 1/2in Shank And 3/8in Thread, with Screw Connection, Ensuring High Stability And Reliability. Manganese Steel: The Drill Chuck Adapter Is Made of Manganese Steel, Quenching And Blackening, with High Hardness And Oxidation Resistance. Easy Installation: The Drill Chuck Arbor Allows for Quick And Easy Installation And Disassembly, Saving You Time When Switching Between Tools. Multiple Usages: This Drill Chuck Arbor Is Widely Used in Tapping Machine, Drilling Machine, Milling Machine, Boring Machine, Pneumatic Tools, Etc. High Accuracy: with Exquisite Workmanship, The Drill Chuck Adapter Has High Accuracy, And A Glossy Finish to Ensure Safe Operation. Specification: Item Type: Drill Chuck Arbor Model: 1/2in-3/8in-24 Material: Manganese Steel Thread Specification: 3/8in, diameter 24mm Connecting Rod: 1/2in Connection Method: Screw Package List: 1 x Drill Chuck Arbor 1 x Storage Box Package List 1 x Drill Chuck Arbor 1 x Storage Box