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