The ReFiner? is a PATENTED two-way adjustable-hinged five iron, engineered to hit golf balls and teach a smooth, even-tempo swing. The accompanying allen key allows users to maintain optimum calibration. Whether you are a beginner or a Pro, The ReFiner has benefits. The Beginner can actually feel and see where the club should be throughout the golf swing. The Low Handicap golfer can improve tempo and timing. ReFiner's patented hinge will break when a swing flaw occurs, giving you instant feedback.