1/4" metal male thread and 1/4" metal female socket. 20mm diameter plastic base. Shaft is 10mm in length including the thread 5mm without thread. Total length including base is 20.5mm. Shaft is 4.5mm in diameter. Specifications: Material:Alumium Diameter:20mm Total length:20.5mm Color:Black Package contents: 1x 1/4 Screw for Camera/Tripod/Flash Bracket Male/Female