The McCormick 6644363A1 is a genuine OEM interlock switch, a critical safety component designed for various McCormick agricultural tractors. This switch ensures proper machine operation and helps prevent unintended actions. It is compatible with specific CX, MC, MTX, T, and V series models, typically those with serial numbers JJE100001 and after. Weighing approximately 0.05 kg, this interlock switch serves as a direct replacement part, ensuring reliable performance and precise fitment for maintaining tractor safety and functionality.