The Terrafirma E Locker is perfect for Land Rovers used in commercial, utility, military, competition and recreational off-road activities. Selectable operation provides 100% drive when needed without affecting on road driving. Vastly improved traction with less need for momentum, reducing the potential of vehicle damage and environmental impact. Less strain on the vehicle’s driveline, reducing wear and tear. Incredibly simple yet effective design with minimal moving parts, resulting in maximum reliability. Suitable for both front and rear axles. Silent operation Super strong 4 pinion design Precision manufactured from high grade materials Fast and straightforward installation, no special tools or fluids require Complete wiring harness and illuminated dash mounted switch The Terrafirma E Locker has the simplest operating system of any switchable diff lock, no compressor, complicated wiring loom or air lines. 2 wires and an illuminated dash mounted switch is all that is required. The uncomplicated switch arrangement also means the E Locker is the fastest switchable diff lock to install, no cutting or welding is required. A simple drilled hole for the electrical cable gland is the only machining operation that is required. A competent mechanic should take no more than a few hours to completely install a Terrafirma E Locker from start to finish. No special oils are required.