The MILWAUKEE M18 4-Tool Combo Kit is on the M18 cordless system with patented technologies and electronics, innovative motor design, and superior ergonomics, providing users with the most efficient blend of power, weight, and performance in its class. These power tools run on Milwaukee REDLITHIUM batteries, delivering users more torque, more power, and longer run-time than the competition. The M18 1/2 -inch Drill Driver is only 7-¼ in length for access to the tightest workspaces while delivering 500 in-lbs of torque and up to 1,800 RPM. The M18 1/4 -inch Hex Impact Driver provides up to 2,750 RPM, 3,450 IPM and 1,500 in-lbs of fastening torque. The M18 4-1/2 -inch Grinder features the user-preferred paddle switch, providing comfort when operating in various positions, and the M18 6-1/2 -inch Circular Saw has a powerful 3,500 RPM motor to easily and quickly cut tough material such as LVL headers.