Bi-metal. Milled and set teeth. Designed for optimal performance, ground to precision sharpness for straighter cuts and a smoother finish. Super sharp to cut fast without deflection, flexes and resists breaking extending blade life. For thick metal cutting 3/32 inch thick. For cutting 3/32 in. to 1/4 in. steels and 3/32 in. to 3/8 in. non-ferrous metalBi-metal jig saw blade14 tpi3/8 in. width .037 in. thick3 in. length2 per card