[HEAVY DUTY] Made as a heavy duty, direct replica of original parts. This cylinder and piston kit will fits Hilti DSH-700 and DSH-700X models. Will not fit DSH-900 models. [NIKASIL PLATING] This plating type is impregnated into the cylinder wall, offers long lasting wear resistance and reduces friction. [CAST IRON] Piston rings are made out of high-quality black oxide cast iron and meet specifications for long term durability. [CYLINDER KIT] Cylinder kit contains piston, cylinders, rings, wrist pin and clips. All packaged together ready to replace your damaged or worn cylinder. [CAST ALUMINUM] Cylinder and pistons are both made from cast aluminum and precision machines for proper fit. [REPLACES OEM PARTS] Replaces Hilti part numbers: 412245 412238 [DURABILITY] Designed and manufactured for a lifetime of durability in rough operating conditions. Super high quality nikasil cylinder set