Choose from 42 or 32 Teeth Per Inch. Fine Kerf Universal Razor Saw has a blade that is .010″ thick with a tooth set range of .012/.014″, 6-1/2″ long, with a 1-3/16″ cutting depth, and steel back for stability. For pull stroke cuts in balsa, other wood, plastic, copper and brass. Leaves smooth edges. 35-550 - 42TPI / 35-500 - 32TP