41100-ZW6-C10ZA Gear *NH246* Case - Overview. The 41100-ZW6-C10ZA Gear *NH246* Case is a vital component supporting the lower unit system of Honda marine engine systems. It serves as the protective housing for the gears that transmit mechanical motion from the engine to the propeller, ensuring your marine drivetrain operates smoothly and reliably. Engineered to match factory specifications, this gear case fits precisely with existing seals and hardware, maintaining optimal performance and durabi