Probably the last spoke wrenches you will need to buy. The 10 interchangeable tips are made of heat-treated steel for strength. The main shaft is CNC precision machined from 7075A aluminum and designed for optimum grip. Included heads: 5.0, 5.4, 5.6, 5.8, 6.0, 6.2, 6.4, 6.6, 6.8, and 7.0.