Choose from 42 or 32 Teeth Per Inch. Fine Kerf Razor Saw has a blade with .010in. kerf, 6-1/2in. length, 1-3/16in. 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 – 32TPI Made in USA.