Check the listing for details. 4" 3 Jaw Self Centering Lathe Chuck MT3 Shank (ROTATING Triple Ball Bearing). Condition: New. Listed at 488.95 USD. Product Description:4" 3-Jaw Lathe Chuck, 3MT shank rotating chuck plate, one set of solid steel internal jaws, one set of solid steel external jaws, and chuck wrench are also included in the package.About the Chuck Revolving Plate: The chuck plate is designed for supporting work pieces during process to be fitted for standard 4" 3-jaw self centering lathe chuck.Triple ball bearing design.The main body and taper shank are made of high quality carbon steel and hardened for high performance and stability.Morse taper : 3 MT.Accuracy: 0.0002".RPM: 3,500.About the 4" 3-Jaw Self Centering Lathe Chuck:High precision self-centering design. Superior gripping force to meet precision machining demands. Flimsy parts are specifically engineered by quenching process to enhance durability.Short cylindrical center mounting.Chuck body is made of high quality nodular cast iron suitable for high rotation speed. Chuck Outside Dia. : 4" (100mm).Chuck Body Thickness: 2" (55mm).Center Thru Hole Dia.: 0.8661" (22mm).Bolt Circle Dia.: 3.3071" (84mm).Max RPM: 4,200.Internal Jaw Clamping Range: 0.0787" (2mm) -1.1811" (30mm).Internal Jaw Jamming Range: 1.1811" (30mm) - 3.5433" (90mm).External Jaw Clamping Range: 1.1811" (30mm) - 3.1496" (80mm). Accuracy: 0.002"(tested vertical