Abstract: A self-loading bit driver tool has a handle generally defining a predetermined axis. A support member, slidably mounted on the handle, moves generally parallel to the axis from proximate to remote positions. Bit storage—a cartridge, cassette or cylinder—stores a number of driver bits and is removably mounted on the support member and adjustably located at its remote end so as to selectively and successively place each stored driver bit along the is of that member. A barrel downstream of the support member and a push rod permanently connected to the handle move along with the member and receive and support the bit driver while the tool is being used. When the support member is moved to a proximate position, a chosen driver bit can be moved from bit storage into the barrel, or later returned to bit storage by means of a magnetic element.