Double Screws locking. No Soldering. Color coded plastic insulation jacket, for easier recognition. Easy fit for wire size up to 4mm. Accepts speaker wire : 19AWG, 18AWG, 17AWG, 16AWG, 15AWG, 14AWG, 13AWG, 12AWG, 11AWG.Features:1. Each plug is equipped with a double screw-lock design that ensures a solid connection.2. These plugs are suitable for home theater systems, wall plates, video receivers and sound systems.3. Conveniently color coded with two different colors for easy polarity identification.Material: Metal, PlasticFit for Wire Size: 4mm / 0.157"Connector Size: 3.5mmSize: 3.7 x 0.55cm / 1.5" x 0.217"(L*D)Package Content: 20 x Banana Connector