This set of 2 Senco EA0140 replacement drill bits works with the Duraspin integrated auto-feed screw system. Made from durable steel, these (2) EA0140 #2 bits are ready to go when old bits break or wear out. Users can work confident that they always have a backup of this 2-piece set. These replacement bits work with Senco Duraspin screwdrivers such as DS300-AC and DS275-18V (sold separately)