Topeak BB Hiden Tool Multi-ToolTopeak BB Hiden Tool Multi Tool. Compact and portable chain tool with 7 function full metal folding tool that slides into your MTB bottom bracket for easy access The built in magnets secure and hold the folding tool in place. For those who like to ride without a bag or pack this stealthy multi tool is a great choice. Allen wrenches 2 3 4 5 and 8mm T25 Torx wrench flat head screw driver Aluminum 13 speed chain tool with steel wire chain hook Compatible