Nike Pro Combo Utility. The Nike Pro Combo Utility features the Nike Speed Step Steel Shaft for Pro Combo Utility The massive 70-gram tungsten plug creates a CG (Centre of Gravity) position that is both lower and deeper than traditional long irons. This makes it easy to get the ball up in the air for more accurate long balls from any lie you encounter. Available in lofts as follows: 18 degree (replaces 2 iron); 20 degree (to replace 3 iron); 22 degree (replaces 4 iron).