The AK Tuck-in Spreader Bar is designed to minimize the movement of the harness up your torso. The wider outline is designed with tuck-in tabs that prevent pivoting. Purely designed for the all-around waist harness rider. Built in the classic stainless steel construction with a simple clip in connection. The Tuck-in Spreader Bar is ideally suited for the Synth harness when being used as a pure waist harness.