For servicing the Camshafts and the Timing Chain during Installation & Removal on Mercedes Benz (3. 0L CDi Diesel engine) Included in kit: 1097 - 2 Pc. Benz Timing Tool Set - M642 Attaches to the camshafts to hold in position when replacing timing chain Services Mercedes Benz M642 CDi (Diesel) engine Aluminum construction with precision machining, including 4 bolt holes OAL: 17. 5cm (6-7/8") Compare to Mercedes Benz factory Tool: #642 589 00 31 1098 - Benz Chain Guide - M642 Use in conjunction with #1097 to guide chain during chain installation