Chris King Hub Service Tool. The Chris King Universal Hub Tool is a high quality shop tool designed to completely disassemble and reassemble Chris King R45D R45 Boost CL Superboost ISO Classic and BMX hubs. Though not required for basic adjustment or routine hub maintenance it makes a striking addition to your tool set allowing professional and home mechanics to perform complete hub overhauls and bearing service. A hub cone adjusting tool and comprehensive technical manual are included in the complete kit.