Ethan 48324 HSS Metal Cutting U-Shank Jig Saw Blade, 3-Inch by 24TPI, 5-Pack High speed steel (HSS) blades are designed for straight or curved cutting in aluminum, fiberglass, rigid plastic U-style shank to fit saw brands, including Skil, Black & Decker, DeWalt, Makita, Milwaukee, Porter Cable, Ryobi, Craftsman. For making straight cuts in thin metal, soft metal. Overall length 3 inches. 24 teeth per inch.