5 X Sunwayfoto Stainless Steel Slotted Post Type 1/4" to 3/8" Tripod Adapter / Bushing TN-2 TN2
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 total height, interior depth is 7.8mm