1/4-3/8'' Flash Bracket Mounting Screw For Lighting Stand, Umbrella Holder, Canon, Nikon, Sony, Tripod Photo Studio Accessories
https://www.vogueparade.com/shopping/EN/A3/22/4000049848679/14-38-flash-bracket-mounting-screw-for-lighting-stand-umbrella-holder-canon-nikon-sony-tripod-photo-studio-accessories//