BOSCH “PROGRESSOR” JIG SAW BLADES For use in all types of materials including metal and wood. The variable tooth pitch (small teeth near shank, larger teeth at the end of the blade), ensures fast cutting and long service life. BOSCH “PROGRESSOR” JIG SAW BLADES For use in all types of materials including metal and wood. The variable tooth pitch (small teeth near shank, larger teeth at the end of the blade), ensures fast cutting and long service life.