1 . Walter Carbide Core Cut annular cutters accurately drill large diameter holes in a variety of hard or abrasive materials such as strainless steel, cast iron, tough alloys or composite materials. They outperform and outlast conventional HSS cutters and allow for higher speed and feed rates while requiring less effort to cut through some of the industry’s toughest metals. Features a specially designed lubricant zone, improved heat transfer, longer life and faster cutting.; .