Engine Long Block Short Block. Diesel engine valve seat insert installation tool for cumminsNT855. Material: 45 steel, hardness of main parts: hrc35 I hope all maintenance technicians can provide valuable feedback after using our store’s tools, I will listen to good opinions, Try to produce high efficiency, high strength, and light weight as much as possible, Convenient maintenance tools for maintenance technicians who work very hard and sweat hard every day, To reduce their labor force, thank you to all the maintenance technicians first. Warning : Cummins parts can be quite complex, and even the same engine model may use different parts. For this reason, we strongly recommend that customers order parts based on the specific part number. If you are unsure of the part number, please provide your engine number or VIN, and we would be happy to assist you in verifying the correct part. The count starts from the day after you placed your order and excludes weekends and holidays. We are subject to labor law regulations that restrict weekend sales services. All the warrantee Are Limited in Parts Only, engine rotation is very Danger, to be safe when the engine running all the people must keep distance at least 10 feet away from engine rotation radius, any time the shut down valve must be active, keep your engine can be stop any time.