23 PNEUMATIC TOOLS; NAMELY, REVERSIBLE IMPACT WRENCHES, VERTICAL GRINDERS, ANGLE GRINDERS, ROTARY DIE GRINDERS, REVERSIBLE DRIVERS FOR SCREWS AND LIKE FASTENERS, DRILLS, CONCRETE BREAKERS, PNEUMATIC DIGGERS, PNEUMATIC PILE DRIVERS, CONCRETE FINISHERS, SCALING HAMMERS FOR REMOVING SCALE FROM METAL, PNEUMATIC HAMMERS, CHIPPING AND CAULKING HAMMERS, RIVETING HAMMERS AND SAND HAMMERS