The elastrator - a device for the castration and docking of livestock.
The whole device has a surgical look to it, bright chrome finish, enough to make you shiver.
Visit http://en.wikipedia.org/wiki/Elastration for a description of the process.
Here it is though
The elastrator - with rubber rings
Ring applied to the prongs
Ring pulled open by the four prongs. The 2 bottom one are pulled down by the centre post
The centre post is marked Elastrator and on the reverse side Made in New Zealand
Now for the real gem The video clip: enjoy