Temco 3 LOT 3/0 Gauge 12in - 5/16 3/8 in Hole Sizes Black Solar Battery Cables Power AWG Solar Inverter Golf Cart Car GLUE SEALED Discount applied automatically when quantity lots are bought. First Hole Size: 5/16", Second Hole Size: 3/8" 3/0 AWG, Copper Conductor Max Voltage: 600 V, Max Amps: 380 Nominal Outside Diameter: 0.675" / Stranding (qty. dia): 1539/0.01"