Bi-Metal Matrix blades with Regular or Variable Pitch Teeth have a high speed matrix cutting edge, electron beam welded to a low alloy shock resistant back and resist heat in excess of 1000 degree Fahrenheit. They cut faster, last 10 times longer than carbon flex back or hard back and have excellent shock and abrasion resistance. Use Olsons Bi-Metal Matrix Portable Band Saw Blades to cut a wide range of materials using portable band saws such as Milwaukee, Makita, Black & Decker, Porter Cable or others that use 44-7/8 inch x 1/2 inch blades.