The Milwaukee M18 FUEL 9 in. Cut Off Saw with ONE-KEY is an extremely versatile solution for cutting a large variety of materials. The M18 FUEL Cut Off Saw runs on Milwaukee's M18 REDLITHIUM batteries (not included) instead of using gas like most traditional cut off saws. This saw delivers the power to cut reinforced concrete as well as a large variety of other metal and masonry materials. It delivers this performance while still being up to 50% lighter than gas saws that dominate the market today. The M18 FUEL 9 in. Cut Off Saw also has ONE-KEY integrated so users can wirelessly connect the tool with their smartphone to track and manage the tool.