Series MXT consists of 18 Vdc Models 8444DWDE and 6349DWDE, and 14.4 Vdc Model 6339DWDE. Shift-Lock drive system locks out clutch with one touch and shifts from drill to driver mode. Two-piece D-21 motor uses rare earth magnet; armature is supported with dual-sealed ball bearings. Operating on two 2.6 A-hr Ni-MH batteries, drill has locking-ratcheting, keyless chuck, and 13-planetary gear system for light, heavy-duty, and extreme applications.