Seachoice Tinned Battery Lug, Fastener: 5/16 in., #2/0 (25-Pack) 60491 - The Home Depot
Amazon.com: 8 Pcs 1 AWG x 3/8 Copper Battery Cable Lugs, Heavy Duty Ring Terminals Connectors, UL Listed Bare Eyelets Tubular Ring Battery Lugs for 1 Gauge Wire - Battery Cable Ends : Electronics