alternative embodiments be composed of an elastomeric material the retaining ring 50 preferably has a diameter that is smaller than the diameter of the cavity 40 when a torque wrench not shown is applied to the screw 10 of the present invention the tip of the wrench extends through the inner opening 52 of the retaining ring 50 pushing the two ends 56 58 apart and causing the ring 39 s 50 radius to expand in a horizontal direction press against the wall 42 of the cavity 40 and press against and grip the tip of the wrench in this way the retaining ring 50 causes the screw 10 to become removably affixed to the wrench during removal and reduces the likelihood that the screw 10 will be lost during adjustment it is important that the retaining ring 50 be composed of material with sufficient elasticity and structural integrity to ensure expansion and avoid breakage while allowing the retaining ring 50 to return to its original unexpanded configuration such as steel or other metal alloys the interface surfaces 25 35 are shaped to transmit torque from the drive part 20 to the threaded part 30 as shown in the figures interface surfaced 25 35 the screw 10 of the present invention may form structures having various shapes or geometries for example in the preferred embodiment the interface surfaces 25 35 of the drive and threaded parts 20 30 include a circular configuration 26 a 36 a in the embodiment shown in fig5 8 the interface surfaces 25 35 of the drive and threaded parts 20 30 include a triangular configuration 26 b 36 b in the embodiment shown in fig9 12.