Belva BST408 4 Gauge Spade Terminals (Pair) - Sonic Electronix
5/16" Spade Terminal with Dual Set Screws and Poly Carbonate Shell 2 Pair
2 Pair Car Auto 4 Gauge Strip Spade Terminal Adapter U Type Crimp Terminal Connector for Speaker Wire Cable Black Red Installation - Speakers & Amplifiers - Newegg.com