Jacobs 33370 JK 160 J6 Industrial Grade Keyless Chuck 3.0 to 16.0 Millimeter Capacity with No.6 Jacobs Taper Mount,Jacobs Chuck,33370" /> Automatic fitting for efficient, fast change of tools Machine fitting via DINO238 of Jacobs tapers and UNF thread fittings Self-tightening feature for maximum gripping power Wide range capacity Each chuck 100-Percent inspected for performance and precision