UCEC Y Plug 45 Degree Spade Connector for Speaker Wire DIY 8 Pack (4 Black 4 Red) Fit Most of Speaker Terminals Perfectly --- 45 degree angled spade plugs, the interior distance between the prongs is 8mm or 5/16 inches, work well at most of the binding posts, especially for 1/4 binding posts. Well-made connectors with a brass sleeve and set screws that are perfect for the majority of hi-fi speakers wire connections. Super Solid Construction --- UCEC Spade Plugs are made of corrosion-resistant gold-plated brass that does not oxidise in air and provide secure fits with clarity, natural sonic accuracy & minimal signal distortion. Alternative for Banana Plugs --- Upgrade to Super quality upgrade to banana plugs. Fits tighter for a more permanent connection. Stable Connection --- No loose ends. The bottom socket can accommodate 12~ 6 Gauge wires by snugging tight with gold-plated set screws that assure great connection. Wide Application --- Fit for amplifiers, speakers, and other electronic devices which use traditional binding posts.support the wire diameter up to 4 mm.