IVY Classic 28432 H1232P 12-Inch 32 TPI Metal Cutting Hacksaw Blade, Bi-Metal, USA, 10-Pack Cuts metal up to 1/8-inch, Cobalt Advantedge (Registered Trademark) Bi-Metal blades with 8% cobalt 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, 32 TPI, 12-inch length x 1/2-inch width x .025-inch thickness