This tool not only holds a spare derailleur hanger for emergencies but also has the essential hex keys&44; Torx wrench & flat & Phillips head screwdrivers: made completely out of metal Zinc plated bolts&44; anodised tools & a machined aluminium body this tool is made tough 2&44; 2.5&44; 3&44; 4&44; 5 & 6 mm hex keys Flat & Phillips head screwdrivers M25 Torx wrench Emergency derailleur hanger holder can be removed without tools