Mitsubishi MMT Utility Shaft .355 TaperMMT Utility Irons Overview MMT Utility Iron shafts were designed to optimize the performance of today's utility iron heads. As golfers increasing turn to utility irons as weapons off the tee or for steep descent angles into par five greens, we needed to make a shaft versatile enough to do both. MMT Utility irons use our Metal Mesh Technology to improve feel and responsiveness to provide the golfer with more consistent launch and spin and the