Lathe Chuck 6 4Jaw, Self Centering Hardened Steel Jaw, Internal External Grinding. Chuck Size: 6 inch / 160 mm. Jaw: 2 Set of 4 Jaws. Accuracy: 0.07 mm (0.003”). Outside Diameter: 160 mm (6”). Bolt Circle Diameter: 115 mm (4.5”). Center Thru Hole Diameter: 45 mm (1.77”). Including: 1 Lathe Chuck Body 3 Socket Head Screws 1 Chuck T Wrench. 1 External Jaw Set (4 Pcs). 1 Internal Jaw Set (4 Pcs). Unit Dim L x W x H (in). 6 x 6 x 4 Estimated.