D7 Irons D7 With RE•AKT™ Technology Puts Power Where It's Needed Most. Long irons feature three rows of Power Holes and a thinner, more responsive face for maximum distance. Fewer Power Holes combine with optimal weighting and extreme feel in the shorter irons for the most precise distance control. D7 helps golfers play their best. Progressive Power Holes Long irons have three rows of Power Holes for maximum distance. Shorter irons have fewer Power Holes with optimized weighting for maximum feel