Use AIR PRESSURE for unstoppable shearing power in backerboard! Combined with Malcoメs unique TurboShearFC design, the TSF2A is the ultimate tool for those who want to make quick, clean cuts in backerboard including window and door arches! Compatible with standard on-the-job or in-the-shop air supply set-ups. Also cuts fiber cement siding. Long wearing blades are easily replaced on the job.