Ethan 37312 - HCS Wood Cutting T-Shank Jig Saw Blade, 3-inch by 12TPI, 5 per pack High carbon steel (HCS) blades are ideal for making straight or curved cuts in soft and hard woods, fiberboard, chipboard, and plastic T-style shank to fit saw brands, including Bosch, DeWalt, Hitachi, Makita, Milwaukee, Metabo, Porter Cable, Craftsman For making curved, cuts in soft wood, fiberboard, chipboard Overall length 3 inches 12 teeth per inch.