When you're fitting for irons, you should establish baseline numbers to start. A certified fitter will have the tools required to establish your numbers. We are looking at the difference between the T100, T100s, T200, T300, 620CB, and 620MB iron heads. To test club heads, you should use the same shaft, and the same lie angle to find what club head gives us the best results. The T200 hundred has less loft than the T100. This means it will go a little farther, a little lower, and spin a little less. The T300 has even less loft than the T200. This club design is a little bigger, with more tungsten, a thicker topline, and more offset. This creates the fastest ball speed, the longest distance, with reduced spin. The T100s creates the same look as the T100, but it was engineered with 2 degrees less loft. This creates faster ball speed, reduced spin, and more distance than the T100. When you look at the 620 CB, you'll get a smaller club head than the T100, and slightly weaker lofts. This inc...