This tool not only holds a spare derailleur hanger for emergencies but also has the essential hex keys44 torx wrench and flat and phillips head screwdrivers made completely out of metalzinc plated bolts44 anodised tools and a machined aluminium body this tool is made tough244 2544 344 444 5 and 6 mm hex keysflat and phillips head screwdriversm25 torx wrenchemergency derailleur hanger holder can be removed without tools