The 2491-23 M12 Cordless Lithium-Ion 3-Tool Combo Kit includes the Screwdriver (2401-20), 3/8 in. Square Drive Impact Wrench (2451-20), and Work Light (49-24-0145). The innovative M12 cordless Lithium-Ion system is designed to deliver the power and torque required for professional applications, in a size that reaches the tightest and toughest places. Powered by Red lithium , the M12 cordless Lithium-Ion system offers unmatched power, speed, and tool belt portability. With purchase of a 2491-23 receive a free M12 2.0 Ah Compact Battery.