Box Packing Machine manual set this is hand tool used for crimping strap seal on metal strap.It can be used by anyone who wants to secure the parcel/packet/bundle with plastic strap and seal. It has three jaws which are tempered to provide long life.hand operated manual ratchet type strapping tensioner, designed to tighten metal strap. used for crimping strap seal on metal strap it is the only tool available worldwide for the final secure strapping of the parcel/packet/bundle/wooden box.