This tool provides perfect positioning for drilling 4 extra dowel pin locating holes. This jig uses the Okrasa/SPG pattern which offsets 1 dowel to index the flywheel so it can only go on one way maintaining flywhee/crank indexing for balance!;Though a lot of guys use this to Rig engines that have jacked up flywheel/crank connections (with a hand drill in the driveway) we ONLY recommend this to be used in a good drill press.Dowel Pin Drill Jig Tool For 4 Dowel to 8 Dowel VW Flywheel