ITEM NAME:10PC 3/8" to 1/4" Convert Screw Thread Adapter f. Tripod Mounting Monopod Camera Everyone is a moon and has a dark side which he never shows to anybody..Allows user to mount a professional-style head with a 3/8"-16 threaded hole on a tripod that has a 1/4"-20 screw. This 3/8"-16 to 1/4"-20 Reducer Bushing allows you to convert any standard 3/8"-16 thread for the insertion of a standard 1/4"-20 screw.