Keyless chuck, 1/4 In. Model #31-120 3/8 In. Drill produces 204 in-lbs of torque. Model #31-121 1/4 In. impact driver: incredible strength producing 885 in-lbs of torque along with a long lasting 2.0 Ah 12 V lithium ion battery give you the ability to drive screws and fasteners effortlessly.