This 17 mm magnetic box v-wrench is needed for securing the top engine bolts from rotating during removal and reinstallation of motor from transmission. The 12 point socket has magnetic insert to hold wrench onto bolt head while the nut is being loosened. This tool is a necessity when doing a clutch replacement with the engine still in the vehicle. Applicable: Porsche models using 17 mm connecting bolts with a hex head. Please call our office for availability.