This is a great tool for squaring the corners of a hinge plate or lock set. We always use a router to mortises out for hinges and lock sets but that leaves the corners rounded. this tool cleans the corners quickly and cleanly.Using a chisel sometimes cuts too deep or digs out too much. This tool will help to make the job go faster with professional results. It's a must have tool and the price is very reasonable for the quality of the tool.