Efficient charging solution: This charger post features an effective stud design that provides convenient access to battery terminals for an improved charging experience. Installation friendly: Specifically crafted to fit a 1 1/4 inch hole, it is suitable for installation in cars, trucks, boats, and ATVs for diverse applications. Safety first: Color coded red and black leads help prevent accidental cross connections during charging and reduce the risk of short circuits. Durable construction: Built from nylon, iron, PVC and brass to withstand tough automotive and marine environments. Use scenario: In a passenger car, install in the engine bay to provide easy access to the battery terminals for regular charging or maintenance. Use scenario: On a boat, mount to a deck or console to maintain the marine battery from shore power or onboard charging routines. Use scenario: In an ATV or truck, install for field maintenance to quickly connect and charge without disassembling components.