IVY Classic 28306 R424P 4-Inch 24 TPI Metal Cutting Reciprocating Saw Blade, Bi-Metal, 5-Pack Cuts metal 1/16-inch and under, Cobalt Advantedge (Registered Trademark) Bi-Metal with 8% cobalt matrix II cutting edge electron welded to alloy-steel back Precision milled shatterproof teeth with Rockwell Hardness of 65-67 HRC Fits all 1/2-inch shank reciprocating saws Bi-Metal cutting edge made in USA on imported blade, 24 TPI, 4-inch length x 3/4-inch width x .035-inch thickness