Features The Clamping Range: The internal clamping range is 5‑100mm, that is, 0.2‑3.9in, and the external clamping range is 98‑135mm, that is, 3.8‑5.3in. Reliable in Fixing: Each claw can be adjusted to the center position with strong gripping force, and the self centering can hold various workpieces. Better Alloy Steel: Adopting premium alloy steel material, the lathe chuck is have been through good workmanship, very durable for long term use. Larger Application: Suitable for lathes, grinders, milling machines, drilling machines, machine tool accessories, woodworking machinery and so on. Quick Installation: Comes with a compact size and a light weight as well, the 4 jaw lathe chuck is very convenient to install in several minutes. 1. The Clamping Range: The internal clamping range is 5‑100mm, that is, 0.2‑3.9in, and the external clamping range is 98‑135mm, that is, 3.8‑5.3in. 2. Reliable in Fixing: Each claw can be adjusted to the center position with strong gripping force, and the self centering can hold various workpieces. 3. Better Alloy Steel: Adopting premium alloy steel material, the lathe chuck is have been through good workmanship, very durable for long term use. 4. Larger Application: Suitable for lathes, grinders, milling machines, drilling machines, machine tool accessories, woodworking machinery and so on. 5. Quick Installation: Comes with a compact size and a light weight as well, the 4 jaw lathe chuck is very convenient to install in several minutes. Specification: Item Type: Lathe Chuck Material: Alloy Steel Chuck Diameter: 6in Chuck Thread: 1IN x 8TPI How to Use: Connect to the lathe and use it. Before use, match the appropriate model and size. packing list: 1 xLathe Chuck 2 x Adjustment Handle 1 x L Wrench Package List 1 x Lathe Chuck 2 x Adjustment Handle 1 x L Wrench