This lock nut is a high-quality product that fits perfectly with Cummins Engine models KTA19, KTA38, KTA50, NT855, and QSK. It is made of durable steel material and comes in a sleek silver color. This pack contains two lock nuts, making it a great deal for anyone in need of this type of product. The OE/OEM part number for this lock nut is 3645029, and it is manufactured in China. It is designed to keep your engine's components secure and prevent any potential damage from loose parts. This product is a must-have for anyone looking to maintain the performance and longevity of their Cummins Engine.