Actually it is not the same principle as the hammer type. This one has several differences/advantages. You provide the turning with your hand on this one. The hammer blows provide the turn on the other. That can damage what you are trying to disassemble. For example: if you are trying to get a hinge off of a door jamb, the hammer type will bend the jamb inward and deform the area before you get the screws loose. There are other places where this can happen also. A motor can be irreparably damaged and etc.
The are times you have no room to swing a hammer.
Wayne, you can "chuck up" an old valve to flatten metal.
A heavy equipment field mechanic will take off bolts on some big part and it won't free up. They use a flattened chisel or bar on their air motor and vibrate the object all over it. Then it comes loose. No room to swing a hammer to tap it all around.
Another tool I have similar to all this, that takes off hardened grease, is a Harbor Freight needler. Super good.
