The FST 115 shafts will not fit the Titleist DCI Black irons. The DCI black irons use a .355" taper tip shaft and the FST 115 shafts are only available in a .370" parallel tip shaft, which is to large to fit these irons. If your DCI Black irons had the Tri-Spec stock shaft the FST would be more flexible, even in the same flex, and would create a little higher ball flight. A shaft like the True Temper XP115 (TT0112) would play and weight similar to the Tri-Spec shafts. TT Lite XL (2XLI) would have been used as a replacement shaft back when these irons were popular.
Date published: 2016-12-21