Radmutter- und Glüh-kerzensch Graupner 1661 for wheelnuts and glowplugs. Practical design of box spanner with 6 different socket sizes 8, 9, 10, 12, 14, and 17 mm, matching most larger sizes used in modelling. The long-shank 8 mm socket is specially designed to suit glowplugs, and the 17 mm socket fits most wheelnuts.