Introducing the D7 Irons From Wilson Staff. Wilson’s previous ‘D’ irons featured thicker top lines with bolder sole designs. This time, the D7 features the Super Game Improvement Technology.The D7 Irons now have a refind and progressive version of the Power Holes Technology, providing an excellent blend of forgiveness, control and precision as you work through the set. Simple and affordable, the D7 range is at aimed at the Mid-High handicap golfer looking for the ulitmate forgiveness and distance. Long Irons: Feature three rows of Power Holes to maximise distance whilst providing a high, forgiving ball flight.