The Alpha Contour blade features a design specifically developed for cutting granite sinkholes. This special design incorporates direct sintered diamond segments on both sides of the steel core and on the peripheral cutting edge, allowing the blade to cut the curved area cleanly, accurately and safely. The Contour blade is available in 4”, 4-1/2”, 5”, and 6” sizes. Special Contour blades are also available for marble and porcelain in the 5” size only