IVY Classic 28206 J318P 3-Inch 18 TPI Metal Cutting U-Shank Jig Saw Blade, Bi-Metal, USA, 5-Pack Cuts metal 1/16-inch - 1/4-inch, Cobalt Advantedge (Registered Trademark) Bi-Metal with 8% cobalt matrix II alloy-steel cutting edge retains hardness Cutting edge electron welded to flexible, alloy-steel back for consistent quality Precision milled shatterproof teeth with Rockwell Hardness of 65-67 HRC. Made in USA, 18 TPI, 3-inch length x 3/8-inch width x .035-inch thickness