FROM THE MANUFACTURER:

The Bosch Cylindrical Rotary Rasp is a special alloy steel rasp designed to shape wood in a power drill that accepts 1/4 In. round shank bits. It rasps and files wood, removing material quickly for grooves and channels. The head shape provides smooth shaping, and the special alloy steel provides long life. The rasp has precision cutting edges that help to resist clogging. The maximum speed for the rasp is 5,000 rpm.