●?Premium Material: This 3 jaw lathe chuck is made of high quality zinc alloy material, which is wear-resistant, strong and durable. ●?Compact Size: This 3 jaw lathe chuck has a compact size, which is portable and easy to use. ●The chuck is suitable for machine tools and accessories for general lathes, economical CNC lathes, grinding machines, milling machines, etc. ●?Diameter: Outside diameter: 12-65mm/0.5-2.6inch, Inner diameter: 1.8-56mm/0.1-2.2inch. ●You are welcome to contact us if you have any problem about our product, we will give you a satisfactory reply.