Delivers maximum cutting performance while outlasting traditional standard pitch models. Bi-metal construction with cutting edge made from premium M42 high-speed steel. Designed with varying teeth height to remove material faster and last longer. Suitable for wood; mild, tool and stainless steels; cast iron; brass and aluminum. Features 1 15/16 in. (49 mm) cutting depth. Durable 0.05 in. side wall prevents collapsing. External coating reduces side wall friction for efficient cutting. Positive tooth rake angle produces faster cutting rates. Size - 4 3/8 in. (110 mm), Type - Holesaws, Variable Pitch - 3/5 TPI, Steel RPMS - 80, Stainless Steel RPMS - 40, Cast Iron RPMS - 55, Brass RPMS - 100, Aluminum RPMS - 120