MK MORSE BI-METAL MASTER COBALT BLADES. THESE PREMIUM BLADES FEATURE MATRIX II CUTTING EDGES AND THE LONGEST LIFE COMPARED TO ANY COMPETITIVE BLADES. VARIABLE PITCH TEETH REDUCE VIBRATION. PACKAGING: 3 BLADES PER BOX, 20 BOXES PER CARTON. LENGTH: 44-7/8" X 1/2" X .020" (1140MM X 12.7MM X .50MM), TPI: 14/18, SET: WAVY