Well, it's a powersaw for a killer kan i'm scratch building.

The wheel part is from a Bricanyl asthma inhaler, it's the gauge that tells you how much is left. The black piece of plastic is a sprue part from a Stikfas toy Stikfas II Products

and the rest is made from plasticard, tubing, sprue bits and some pre-cast hex-nuts with pokey-outy-bits that are for gundam kit builders. These things are awesome. You get 78 variously sized bits on a sprue for about 168 yen (about $1.60 Aus or Can) You might have a hell of a time finding them outside of Japan tho.