These Bi-Metal Matrix blades with regular teeth have a high speed matrix cutting edge and an electron beam that is welded to a low alloy， shock resistant back. These blades resist heat in excess of 1000 degrees F. They cut faster， last 10 times longer than carbon flex back or hard back and have excellent shock and abrasion resistance. Use Olson’s bi-metal matrix portable band saw blades to cut a wide range of materials using portable band saws such as Makita or others that use 32-7/8 in. x 1/2 in. blades.