I bought this tool for cutting some heavy timbers for some roof trusses and was very disappointed with it. It is impossible to get a good square cut with it. Although you can follow a straight line on the cutting surface, the blade tends to wander as it cuts through the lower half of the material. We ended up using a Skilsaw to cut around 4 sides and finishing the center with a Sawzall. The Prazi is NOT worth the money for precision work.