Malco precision fit and hardened Magnetic Hex Chuck Drivers, with 1/4" (6 mm) 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. Malco's MSHML14 model has a 1/4" hex with a 4" (102 mm) length.