This carbide and steel saw grinder has a diameter capacity from 7″ to 42″. It allows you to face, top and side grind saw blades. The AV-40 is one of the fastest grinders to set up and easy to use. When changing from face to top grinding and from one diameter to the next, just loosen a lever and rotate an arm. This machine will save you 25% of the set up time over other grinders, AND is less costly.