The vanos unit is designed to vary the engine intake and exhaust valve timing to help improve engine performance.This kit can be fitted by any competent mechanic or DIY enthusiast.No special tools are required other than the included water pump pulley tool.Cam locking tools are not needed.The long term solution is to use the Vanos Seal Kit to replace the o-rings with Viton o-rings, along with custom designed PTFE rings, restoring performance to factory condition and over the life of the engine. Fitment: For double dual vanos rattle repair on 6 cylinder engines.Compatible with M52, M54, and M56 models. Color: As shown Material: Metal Package Contents: 2 x Seal Repair Ring Only the above package content is included; other products are not included. Important: This is a non-OEM part.Any brand or model cited is used to denote device compatibility.