Fomito 5 x Black Metal 1 4 Male to 1 4 Female Screw Adapter for Camera Tripod L Type Bracket Stand tripod ball head Black Metal 1/4 1/4 inch metal male thread and 1/4 inch 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