The Milwaukee M18 4-1/2 in. Cut-off/Grinder delivers the speed， durability and ease-of-use to handle industrial applications. The cut-off grinder has a 4-pole motor， providing maximum power when cutting or grinding. The tool is the only cordless cut-off/grinder in the market to feature the user-preferred paddle switch， providing comfort and ease-of-use when operating in various positions. L-shape intake vents protect the grinder cut-off tool by keeping harmful debris from entering the tool and damaging internal components. The tool is powered by M18 Red lithium battery packs (sold separately)， delivering 35 percent faster cutting speed and up to 50 percent more cuts on a single charge.