Hitachi 725447 2 8-Inch Lox Driver Bit (Discontinued by manufacturer),Hitachi,725447" /> This 8-inch long bit features twelve points of contact, three times more than the four points of the Phillips and Robertson (square) it is not uncommon to drive as many as 25,000 screws before replacing the bit This quick-change bit is designed for the Senco tool This bit is ideal for contractors, serious do-it-yourselfers, machine shops, and mechanics Comes with a 30-day limited warranty