11 and 13 teeth per inch for a fine finish. Reinforced back for extra rigidity, makes a straighter cut. Induction hardened teeth stay sharper twice as long. 3 sided precision ground teeth offer razor sharp cutting edges at every stage of the stroke. Bi-material handle screwed and ultrasonically welded for comfort and security. Handle with marked 45° and 90° angles. Finger rest - ergonomic design, useful for extra control when starting a cut.