Roller Type Stud Driver/Extractor - 6mm (287B.6) - the 287 Series are the best and most
compact stud extractors I've ever used. Great for removing and
installing studs, even in tight spaces. Studs are gripped in
either direction by 3 sets of rollers (see photo) . 1/2" drive for plenty of torque.
The 6mm size is popular for most
European cylinder head to valve cover studs.