1、THREAD CONNECTION: This drill chuck arbor adopts thread connection, the thread specification is 3/8in, 121.1mm length, with R8 shank, easy to connect and install. 2、PREMIUM MATERIAL: Made of excellent manganese steel, the drill chuck arbor has strong resistance to oxidation, high hardness, and long service life. 3、EASY INSTALLATION: The drill chuck connecting tool allows for quick and easy installation and removal, saving you time when switching applications. 4、WIDE RANGE OF APPLICATIONS: The threaded drill chuck arbor is widely used in tapping machines, drilling machines, milling machines, boring machines, pneumatic tools, and more. 5、PORTABLE DESIGN: The drill chuck arbor adapter is easy to carry with you, making it convenient for use anytime, anywhere.