This valve spring is designed to fit Cummins engines KTA19, KTA38, KTA50, and NT855. They are a necessary component in maintaining the proper functioning of your engine's valvetrain. These valve springs are manufactured in China and are of OE/OEM quality. They are ideal for those in need of a replacement valve spring for their Cummins engine. Purchase this set with confidence knowing that you are getting a quality product that will help keep your engine running smoothly.