Abstract: The multisized fastener driving tool includes a plurality of sockets slidably received one within the other. A first or outer most socket (A) includes a plurality of first fastener engaging portions (20, 22, 24) for engaging alternate corners of a fastener driving surface and a plurality of first guideways, one positioned between each of the first fastener engaging portions. A second socket (B) includes a plurality of second fastener engaging portions (50, 52, 54) which are slidably received in the first guideways and are adapted to engage the driving surface of a smaller fastener. A third socket (C) includes a plurality of fastener engaging portions (80, 82, 84) which are slidably received in the second guideways and the first fastener engaging portions for engaging a still smaller fastener. Additional sockets may be provided for accommodating yet smaller fasteners. An end cap (E) is configured to be connected with a ratchet drive or the like.