Abstract: A coupling mechanism is disclosed for a male member to couple with a female member. The male member may be a handle or extension with a tool driver end, and the female member may be a socket wrench, as an example. The male member has a detent member which is movable laterally in a recess near a first end of the male member. A transverse pin is slideable in a transverse aperture removed from the first end and is coupled by linkage means with the detent member. The linkage means includes a cam and a cam follower acting on the detent member and a spring acts through the linkage means on the detent member. When the transverse pin is pushed into a first position this establishes the detent member urged laterally outwardly by the spring through the cam and follower. When the transverse pin is manually moved to a second opposite position the detent member is permitted to move laterally inwardly to uncouple the male and female members.