Greenworks 24V Brushless Drill:Model number is DDG401.The cordless drill driver is used to drill in all types of wood materials (lumber, plywood, paneling, composition board, and hardboard), ceramics, plastics, fiberglass, laminates and metals. The 1/2" drill has a two-speed switch designed for drilling or driving at LO (1) or HI (2) speeds. A slide switch is on top of the machine.When you use the machine in the LO (1) speed, the speed decreases and the machine has more power and torque.When you use the machine in the HI (2) speed, the speed increases and the machine has less power and torque. Greenworks 24V Impact Driver:Model number is ISG402 .The Brushless Impact Driver is used to driver long deck screws when you assemble a deck and carriage bolts into deck posts and screws into block walls and concrete and screws into metal studs.