Callaway Big Bertha driver adapters are typically for .335″ or .350″ shaft tips, designed to fit various models (like Fusion, Epic, Rogue, Alpha, 815/816) and adjust loft/lie (Draw/Neutral), often made from titanium/PVC, but specs vary by specific Big Bertha generation, so you need to match your club’s year/model (e.g., 2023 Big Bertha vs. Great Big Bertha 2015) to the correct adapter for shaft size and functionality.
