TIMBERLINE by Amana 305-40 FIBERFORCE BLADE 12" X 40Tx 1"The Timberline FiberForce blade contains a unique 6 tooth carbide tipped design that is made for cutting single sheets of cement board or Wonderboard. Special flat top tooth grind Hardened body for long life Unique shoulder design for consistent chip removal Harder carbide for maximum cutting life Designed to cut: Cement board or Wonderboard