A receptacle for use in fastening two members together. The receptacle is adapted to be mounted on one of the two members and to be coupled with a stud mounted on the other of the two members. The receptacle includes a base and a pair of arcuate slightly resilient projections extending from the base. The member to receive the receptacle has surfaces thereon forming a recess conforming to the configuration of the cross section of the receptacle. The relative dimensions of the recess and the receptacle are such that when the projections on the receptacle are resiliently depressed slightly toward one another, the receptacle can be positioned in the recess on the member and the projections released whereupon they will tend to return to their initial configuration and thus frictionally engage with the surrounding walls of the recess so that the receptacle is mounted on the one member. The base has a hole which is aligned with a hole in the one member to receive the stud therethrough. The stud and receptacle are provided with a slot and a corresponding cam follower and a spring to accommodate axial movement of the cam follower in the slot as the stud is rotated relative to the receptacle.