For Use with a Pneumatic Impact Tool to Loosen Rusted or Seized Fasteners. A 3/4\" open end wrench can be used to turn the socket while impacting the fastener. A locking pin in the driver keeps the bit holder in place on the square drive for safe operation. The bit holder can be removed from the driver by depressing the pin. Works faster than hand impact tools. Especially useful for removing brake rotor screws. The tool works with 5/16\" hex impact bits. Kit includes Phillips #1, #2, #3, #4 and a straight slot bit. 60540 Pneumatic Seized Fastener Driver 60550 Bit Adapter Holder 29630 #1 Phillips Bit 30180 #2 Phillips Bit 29550 #3 Phillips Bit 30190 #4 Phillips Bit 30170 3/8\" Straight Slot Bit