A 1:18 (4" action figure scale, G.I.Joe, Star Wars, Micronauts, H.A.C.K.S., etc) chainsaw. The grips are 3mm, compatible with most 4" scale figures, Legends Scale Transformers, most building figures including Mega-Construx, Kre-O, and the leading brand., and more.
I have a lot of chainsaws (and other stuff) to choose from!