This 16 gauge GXL Automotive Primary Wire is a durable type of hook-up wire consisting of stranded copper conductors and a thin-walled, cross-linked polyethylene (XLPE) insulation..056" Diameter, 60 Volts Choose this product today or browse more AWGs with Remington Industries. This hook-up wire construction is capable of resisting high temperatures of up to 125°C (257°F); the XLPE coating also protects the wire from abrasion, oils, chemicals, fuels, and solvents, while also remaining flexible enough to fit wherever it might be needed.