The MANTARAY Water-Powered Cutter/Grinder from La Plata Industries, Inc. is a hybrid system that cuts or grinds materials like granite, concrete, marble, natural stone, and steel. It utilizes a stream of water on a diamond blade or aluminum grinder cup wheel, which substantially reduces dust while using. The MANTARAY Water-Powered Cutter/Grinder is a handheld unit and is designed to be used with 6" to 7" diamond blades or 4" to 5" lightweight aluminum grinder cup wheels and an adjustable pressure washer using 2500 - 4000 psi. The cutter use requires 2500 p.s.i. and the grinder use requires 4000 p.s.i.