Abstract: A wrench adapter includes an adapter shaft having an adapter tip located at its one end and attachable to a wrench socket and a wrench adapter head located at its other end and defining therein a driven hole for receiving a tool bit, and a first wrench driven portion and a second wrench driven portion disposed at the periphery of the wrench adapter head at different elevations and drivable by open-end wrenches or adjustable wrenches of different sizes.

Abstract: An extension rod comprises a joint segment integrately formed on the extension rod, and a socket-coupling segment pivotally connected with the joint segment. The socket-coupling segment has a socket tool coupling assembly and a joint black coupling assembly that can jut out or retract from the surface of the socket-coupling segment so as to be combined with or released from an external socket tool and the joint segment, respectively. The socket-coupling segment further has a pressing head for controlling an operating pin that drives the socket tool coupling assembly and the joint block coupling assembly simultaneously.

Abstract: A multiple sliding extension rod comprises an ejector pin disposed axially within its one end; a pressing head disposed radially through the wall of the extension rod with its end having an incline extended into the inclined pathway to allow the ejector pin reciprocating during pressing head being pressed and released; the ejector pin further comprising a ball-socket that consists of a first seat and a second seat successively wherein the first seat is deeper than the second seat. When said ejector pin reciprocates, the second seat pushes a retaining ball disposed in the wall of the extension rod upward and protuberant from the external surface of the extension rod; alternatively, the first seat receives the falling retaining ball and lead the retaining ball withdrawn from the external surface of the extension rod.