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