This is a Final Fantasy 7 inspired Buster Sword scaled for Transformers Legends Class Figures. The handle is is a 5 MM peg which works with many Transformers.
This is intended for adult figure collectors. This is not designed for rough play by children.
This was tested with White Natural Versatile Plastic and fit with no problems. Depending on the plastic you choose, sanding or polish may be needed to fine tune the fit.