Standard 1/4inch-20 Female to 3/8inch-16 Male Screw Adapter Reducer Bushing3190
The tripod screw adapter have Cuts on one end so that you can use a coin to wind up the screw. 5 convert screw adapters. Applicable for ball head, tripod, monopod, DSLR, flash brackets, Lens Plate Button Heads and etc.