AusAngle

The AusAngle turns any power saw into a portable compound mitre saw, and gives you a perfectly straight cut at any angle.

It’s fast and accurate, and you don’t need to keep walking over to your saw bench to make your cuts. Simply attach your power saw to the AusAngle, adjust and set it, to make a perfectly accurate cut on the spot.

You can cut unlimited long lengths. The base unit cuts up to 300mm and, by simply adding extension tracks, increase the length of the cut by an extra 750mm with each extension piece.
 
The AusAngle protractor enables you to easily cut a compound mitre or angle. And you can use it with a router, instead of a circular saw.

Check it out here http://www.ausangle.com/