Car Battery Terminal Connectors Compatible With Cars, Vans, Trucks and More. Dimension - For wires diameters 5.2 - 7.4mm (AWG gauges 1 - 4) or section 16 - 35mm. Minimum wire size: 16mm (5/8 inch ). Max wire clamp: 9.5mm/0.37in, Mini wire clamp: 6.5mm/0.25in. Easy to use - The battery post terminals connectors are easy to identify with positive (red) and negative(black) labeled. Comes with 1 hex key for easy installation. Wiring is easy to modify and connection is firm. Batteries can be connected to the battery posts by pressing down the lever, so no tools are needed.