US Patent 7762906 Golf club head with a low density bore-through hosel

A golf club including a head, a bore-through hosel insert, and a shaft is disclosed and claimed. The head includes a passage in which the bore-through hosel insert is positioned and retained. The bore-through hosel insert has a specific gravity much lower than the club head specific gravity. This allows mass that would necessarily have been located in the hosel in the heel of the club head to be relocated to more beneficial areas of the club. This allows the club designer to, for example, increase the overall size of the club head, expand the sweet spot, enhance the moment of inertia, and/or optimize the club head center of gravity location.