Material: The decorative mirror screw is made of brass, sturdy and durable, not easy to rust, and has a strong bearing capacity. Thread Dia: M3; Thread Length: 14.5 mm/0.57"; Nail Cap Size: 9 mm x 6 mm/0.35" x 0.24"(OD H); Washer Size: 7.5 mm x 2.5 mm/0.3" x 0.1"(OD H).