Polarized Socket Box, Color Stainless Steel, Gauge 20 ga, Connection Material Tin Plated Copper, Insulation Material Lexan, Housing Material Stainless Steel, Connection Type Plug-In, Max. Voltage -, Length 3 1/2 in, Width 3 1/4 in, Depth 3 1/2 in, Max. Jaw Opening -, Features Polarized power Socket, For Use With Mfr. No. 6139 Plug-in Booster Cables, Includes 4 ft 4 AWG Leads with Copper Ring Terminals