JAPAN! SOUL 4 THREE-JAW LATHE CHUCK with PLAIN BACK MOUNT #SO-4X August 14, 2023 admin Made in Japan by Soul. This is a 4 Three-Jaw Lathe Chuck w/ Plain Back Mount. Chuck Diameter: 4-3/8″ Number of Jaws: 3 Chuck Thickness: 2-3/8″ Through Hole: 15/16 Mount: Plain Back. Comes exactly as shown in pictures. Share