A hand-held hammer impact. Used for both philips and slotted screws, and can be used with sockets. Mine is 1\2" drive. While a lot of you know about this tool,this is for people working on old equipment that may have damaged screws(or good screws that they want to stay good)it applies both turning force and downward force at the same time. BTW, I don't sell tools, just trying to help! PDS 