4 PCS 1/4 to 3/8 Tripod Thread Screw Adapter Reducer Bushing Converter $14.72 Free shipping Camera Mount Thread Size Adapter 10pcs 1/4" 20 To 3/8" 16 Reducer Bushing Convert Screw Adapter For 10 Pack Adapters Desmond Brand. Stainless Steel; Super-Strong; Ideal for Clamp replacement; 12 pieces Used 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., 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., 8mm in height., Desmond Brand., 100% metal., 10 Pack 10 Pack Slotted Post 9mm Tripod Bushing 1/4 3/8 Adapter Convertor Stainless Steel Desmond Screwdriver Slot 1/4 metal male thread and 1/4 metal female socket.