The story of Single Length irons is not a modern trend but a thread that runs across an entire century. Their core principle—uniform shaft lengths for all irons, one setup, one swing—was born long before Bryson DeChambeau ever entered the spotlight. As early as the 1920s and early 1930s, Bobby Jones played a nearly uniform Spalding iron set, delivering the first historical proof that standardization in the bag can produce elite performance.

Jones chose a set with minimal length variation, balanced swing weight, and consistent feel. This allowed him to maintain almost identical swing mechanics and identical setup across the entire set. In an era without standardized club manufacturing, his configuration was a quiet technical revolution—and Jones used its advantages with absolute mastery. In 1930, he became the only player in history to win the true Grand Slam. His achievement showed clearly that a consistent motion reduces errors and holds up under pressure.

The underlying principle remained unchanged for decades: fewer variables mean greater repeatability. That idea is the foundation of today’s Single Length philosophy. But the road to mainstream acceptance was long. In the late 1980s, Tommy Armour attempted to bring the concept to the mass market with the EQL set—without a tour ambassador, without refined weighting, without technical solutions to distance issues in the long irons. The result: a good idea at the wrong time.

The real renaissance began in 2015. Bryson DeChambeau won both the NCAA Championship and the U.S. Amateur using a custom-built One Length set, delivering the long-awaited validation at the highest level. When Cobra Golf introduced the King F7 One Length in 2016, the company combined this momentum with modern engineering: optimized lofts, precise CG positioning, tungsten weighting for higher launch in long irons, and heavier heads in the wedges. With this, they achieved what others could not—a uniform set that still delivers proper distance gapping.

Today, the concept stands for one clear advantage: a single swing instead of many variations. Whether through Bobby Jones’s historic Grand Slam or DeChambeau’s modern victories, the idea has proven for 100 years that less complexity creates more consistency.

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