Features Manganese Steel The chuck mandrel is made of excellent manganese steel with blackening surfaces and high oxidation resistance. High Hardness The chuck mandrel has high hardness and longer service life. The thread size is 1/2 inch, 20 mm long and the connecting rod is R8. Connection Method The chuck mandrel is connected by a screw connection, so you can easily operate it and use it in the actual process. QUICK & EASY INSTALLATION The chuck mandrel allows for quick and easy installation and disassembly, saving you time switching between applications. Wide Application This high precision drill chuck mandrel is widely used in thread cutting machines, drills, milling machines, drills, pneumatic tools, etc. Specification: Item Type:Chuck Mandrel Material: manganese steel. Thread size: 1/2 inch, 20 mm long, approx. 20 mm / 0.8 inches. Connecting rod: R8. Connection method: screw Package list: 1 x threaded chuck mandrel Package List 1 x Threaded Drill Chuck Arbor