Sunwayfoto Stainless Steel 1/4-Inch to 3/8-Inch Tripod Adapter / Bushing TN-1 TN1 5
5 pack. Use to convert a 1/4"-20 threaded post to a 3/8"-16 or to convert a 3/8"-16 thread socket to a 1/4"-20. Screwdriver slot for removal. 9mm in height.