Cordless cut-off tools are dedicated, compact cutting tools that rotate abrasive discs or wheels to cut metal and other materials. They make cleaner cuts than angle grinders and are smaller to fit into tighter spaces. They set their wheel in a stable cutting position, so they don't have to be turned on their side and balanced like an angle grinder to make cuts. Cut-off tools are equipped with a wheel guard that deflects sparks, debris, and shattered wheel fragments away from the user. These tools run on batteries, so they are more portable than corded tools and allow use where access to a wired power source is unavailable. They use brand-specific batteries, which fit different tools from the same manufacturer. Battery voltage and series must be compatible with the tool.