The McCormick 3678225M1 is a genuine OEM drive gear, essential for the transmission system of various McCormick MC and MTX series tractors, including models like MC100, MC105, MC115, MC120, MC135, MTX110, MTX120, MTX135, MTX140, MTX150, MTX155, MTX165, MTX175, MTX185, and MTX200. This high-quality gear ensures smooth and efficient power transfer. Also compatible with select Massey Ferguson 6200 and 8100 series tractors. Weighing approximately 0.8 kg, it features 30 teeth with an outer diameter of 100 mm and an inner diameter of 50 mm, designed for precise fit and durability.