Craftsman Impact Grade Bolt Out 10 Piece Damaged Bolt/Nut Remover Set #52165 Spiraled, fluted taper on socket interior bites into damaged fasteners and won't let go When turned counter-clockwise, socket grabs/contacts greater surface area Use with impact wrench, air ratchet, hand ratchet or breaker bar Ideal for automotive, motorcycle, marine and industrial applications or home use