This Spanner Set is specifically designed for older Worcester Bosch Greenstar System Filters, models pre-2016. The black spanners are branded by Worcester and are essential for maintaining and repairing your boiler. With an energy efficiency rating of A+++, these high-quality tools ensure a reliable and efficient heating system for your home. Ideal for DIY enthusiasts and professionals alike, this Spanner Set is a convenient and practical addition to any heating system maintenance toolkit.