Features STANDARD SIZE: The chuck shaft has a 1/2" shank. and a 3/8" thread with screw connection, ensuring high stability and reliability. EASY INSTALLATION: The chuck shaft allows for quick and easy installation and removal, saving you time when switching between tools. MULTIPLE USES: This chuck shaft is widely used in tapping machines, drilling machines, milling machines, drilling machines, pneumatic tools, etc. HIGH PRECISION: With exquisite workmanship, the chuck adapter has high precision and a glossy finish to ensure safe operation. Specification: Item Type: Drill Chuck Model No.: 1/2in-3/8in-24 Material: Manganese Steel Thread specification: 3/8 in., diameter 24 mm Crankset: 1/2 in. Connection method: screw Package List: 1 x Drill Chuck 1 x Storage Box Package List 1 x Drill Chuck Arbor 1 x Storage Box