Tiger Zirc UltraCut 4.5 inch 1 millimeter type 1 cutting wheels deliver unmatched cutting performance and toughness when cutting steel and other thin metal material. Proprietary SOLID CORE technology increases density of the wheels, resulting in longer life, reduced friction, and superior stability. From the first cut, operators will experience lightning fast, smooth cutting, and exceptional control for clean, precise cuts on thin sheet metal, profiles, and small diameter rods with a right angle grinder.