An angle grinder, also known as a side grinder or disc grinder, is a handheld power tool used for grinding (abrasive cutting) and polishing.Although developed originally as tools for rigid abrasive discs, the availability of an interchangeable power source has encouraged their use with a wide variety of cutters and attachments. Maintain power tools as per the manufacturer's specifications; Inspect tools daily and look for broken or loose parts. Remove damaged or defective tools from service and tag them for repair. Check pneumatic and hydraulic hoses on tools for damage; Only use tools in good working order; Store tools in dry, secure locations; General Tool SafetyFind information on the most common power tools for DIY projects around your home, including jigsaws, circular saws, miter saws, sanders, and drills. Where this hazard exists, spark-resistant tools made from brass, plastic, aluminum or wood will provide for safety. Power Tool Precautions. Power tools can be hazardous when improperly used. There are several types of power tools, based on the power source they use: electric, pneumatic, liquid fuel, hydraulic and powder-actuated.