Cobra driving iron adapters (hosel sleeves) are small, adjustable components that fit into utility/driving irons, typically for .370″ taper shafts, allowing loft/lie changes (+/- 2 degrees is common for newer models like FutureFit33), changing the effective club length, and are specific to the iron model (e.g., King Utility, DS-ADAPT), with specs varying by club, but focusing on compatibility and adjustment range rather than one universal spec.
