It's about a Penny Size, Head Dia (D) : 3/4in (18mm) --- Cap Height (H) : 0.16in (4mm) --- Shank Length (L) :3/4in (18mm) --- Shank Dia (T) :0.08in (1.8mm)
Made by Steel with double layer Antique Copper Electroplated finish
Need to use Needle Nose Pliers and Tack hammers to install them.. without this tools the shank may get bent..