Feature:1. 2 Sets Clamp Jaw: The tired chuck has 3/32in to 1‑7/8in external clamping range and 11/32in to 3‑3/8in internal clamping range, while the round chuck 1‑1/2in to 3‑1/8in external clamping range and 2in to 3‑7/8in internal clamping range.2. Premium Material: Mainly made of premium alloy steel material, the lathe chuck is not likely to deform and very sturdy for long term use.3. Standard Threads: Including 1in x 8TPI spindle adapter, the 4in chuck also has M33 x 3.5 thread for stable and reliable working.4. Wide in Utility: Suitable for lathes, grinders, milling machines, drilling machines, machine tool accessories, woodworking machinery, etc.5. Easy to Install: Comes with a compact size and a light weight as well, the 4 jaw lathe chuck is very convenient to install within minutes.Specification:Item Type: Lathe ChuckMaterial: Alloy SteelChuck Diameter: 4inChuck Thread: 1in x 8 TPI.Package List:1 x Lathe Chuck4 x Jaw (Tied Together)1 x Screw1 x T Wrench2 x Adjustment Handle