As a compact bit driver, it has four standard hex bits to tackle almost any job. You can also use this tool as an angle driver when the going gets tough by moving the bit adapter to the hex driver wrench. Just push the button for a bright little L.E.D. flashlight. Also has an oxygen bottle wrench on the underside, which makes it useful for emergency rescue use. The pry bar on the underside works well to open bottles and jar lids, among other things. It�s also removable if you want. Each of the bits has a spring-loaded ball detent to keep it in the holder, and a fingernail groove to aid bit removal.