.Its defs not a strapping thingo. Its too heavy duty for that. It has a 1/2 metre lever. .
You know they do the same thing for metal straps, the kind you find around big 20-30kg steel frames?
you feed the pieces of metal strapping around the metal bundle, get the metal clip and then you pump the thing to bind it together and press the clip together and cut the roll of binding strap.

Although turns out i might not be right :)