Variable tooth spacing for cuts in different materials, flexible and shatter-proof. For cutting metals, wood with nails and synthetics Fire and Rescue Bi-Metal OAL = 150mm / 6" 1.8 - 2.5 TPI Cuts 3 - 100mm / 1/8 - 4" metal embedded wood or 3 - 12mm / 1/8 - 1/2" metal