Product Description 1 Pair (2) of our top of the range high quality 24k gold plated on OFC insulated speaker binding posts + 30cm of 4% audio grade silver solder.    Specification 24k Gold plated on pure OFC. All parts encapsulated in hard plastic shell. 1 x Red 1 x black. Accepts 4mm banana plugs or 8mm spade / fork connections. Twist of solder connection.  30cm Audio grade 4% silver solder. Dimensions: Shaft diameter 8mm. Overall length (closed 49mm) (open 55mm). Maximum overall diameter 22mm. Diameter of top screw 16mm.