Cobalt M42 cutting edge provides increased steel strength compared to M3 standard steel. 1 7/8" cutting depth and a 4/6 variable tooth configuration. Fleem ground teeth clear chips away fast. Thin kerf design for faster cuts and greater precision. Backing plate is 3/16" thick heavy-duty steel. For long life and fast cutting of fiberglass, plastic, wood, steel, aluminum, brass and cast iron. Cats eye openings in backing plate allow easy plug removal and line of sight visibility. Diamond shaped sidewall cutouts increase visibility while cutting.