Malco precision fit and hardened Magnetic Hex Chuck Drivers, with 1/4-inch power insert shanks, meet on-the-job demands for performance and service life whether installed on an electric power drill or used with a CONNEXT Quick Change Handle. Hex Driver sizes are color coded for easy identification and are available in shorts, longs and extra long sizes.Short,Yellow,5/16,1/4 (6),1/2 (13),1-3/4 (44)