Precision quality Desmond Photographic brand 1/4"-20 Stainless Steel (metal) Tripod Screws. 1/4" metal male thread with flat head screwdriver / coin slot. Shaft is 12mm in length, approx 5mm threaded, 7mm unthreaded Total length including base is 15mm. Diameter of the head is 14mm. Flat / Coin slot