jjc male 1/4"-20 to female 3/8"-16 threaded screw converter adapter for mounting camera and other devices with female 1/4"-20 thread to tripod, monopod and other devices with male 3/8"-16 thread jjc this jjc adapter converts a 3/8"-16 male threaded screw to a 1/4"-20 screw. the adapter is made of solid aluminum.