6-Jaw 5in 125mm Lathe Chuck Self-centering Hardened Chuck K13-125 Adjustable November 17, 2023 admin Lower jaw:6 lower jaw. Jaw material: Hardened steel. Durable two sides are polished and hardened. High-quality materials-The main body of the chuck is made of high-quality cast iron. All guide rails and bearing surfaces are precision machined. Share