Keegan Bradley says he has received strange looks because of his two 4-irons. (Pennington/Getty Images)

By Jonathan Wall, PGATOUR.COM Equipment Insider

IRVING, Texas — Keegan Bradley's course record 10-under 60 at the HP Byron Nelson Championship was impressive for a number of reasons. Bradley managed to post the score with back-to-back bogeys on his card, and went 7 under over his last eight holes.

Another interesting tidbit about the round? Bradley had two Cleveland 4-irons in the bag during his record-setting round. You read that right: two 4-irons. We've seen players employ two drivers in the past (Phil Mickelson at the 2006 Masters comes to mind), but rarely do you see a pro carry two of the same iron.

Even though the numbers are the same, Bradley said the irons are slightly different when it comes to yardage and ball flight. The first 4-iron, a Cleveland 588 MT, has 21 degrees of loft and is a game-improvement long-iron that features a hollow head design that allows weight to be distributed for a lower, deeper center of gravity.

Even though the MT irons are sold as a set, a number of Cleveland staffers have been replacing their long irons and hybrids with the MT this season — including Bradley, who used a 3-iron at the beginning of the season before switching to a 4-iron.

By Jonathan Wall, PGATOUR.COM Equipment Insider

PACIFIC PALISADES, Calif. -- Keegan Bradley has been working his way into Cleveland's latest clubs over the last few weeks. After putting two new RTX wedges (52-degree and 58-degree) in the bag at the Phoenix Open, Bradley spent time early in the week at the Northern Trust Open testing a new Cleveland Classic XL Custom driver (9 degrees with a w/ Miyazaki Indigo 61x shaft), 588 MT 3-iron (Miyazaki C Kua 83x hybrid shaft) and a set of 588 TC irons (4-P w/ X-100 .50" over length).

After giving all of the clubs a test run on the course, he decided to put the Classic XL Custom driver and 588 MT 3-iron in the bag. The three-time PGA TOUR winner grew attached to Cleveland's latest driver offering after spending some time with it at home last week in Jupiter, Fla.

Bradley noted the new driver gave him roughly 12-15 additional yards of the tee, and was incredibly accurate.

While the driver may be the most talked-about switch in Bradley's bag this week, the 588 MT 3-iron is likely the club to keep an eye on going forward.

Released late last year during PGA TOUR Qualifying School, Cleveland's Golf Director of Tour Operation Rob Waters, said eight players put at least one 588 MT iron in the bag immediately. Since then, 90 percent of Cleveland staffers have put one 588 MT iron in play, with 50 percent adding at least two 588 MT irons — including Graeme McDowell, who put a 4- and 5-iron in the bag at Riviera.

Bradley told Waters after a practice session that the iron gave him the ability to, among other things, execute a high cut, a shot he hadn't been able to hit consistently with a 3-iron.

Bradley also considered putting the 588 TC irons in play, but opted to wait a couple weeks and test the clubs out at home.