Sonic Tools combination wrenches include an open-end on one end of the wrench and a box-end on the other end. The box-end of these wrenches include a 12-point design for easier and quicker engagement of fasteners. This 7-piece set covers sizes from 25mm to 32mm. Sonic wrenches are made from Chrome-Vanadium steel for a lifetime of durability, strength, and corrosion resistance.