This 39-piece Sonic Wrench set is all about wrenches. All Sonic Tools wrenches are made from Chrome-Vanadium steel that offers a lifetime of durability and resistance to weather and chemicals. Hinged Socket Wrenches offer the benefit of a ratchet and socket with two sizes on each wrench. The Star wrenches cover specialty sizes from E6 to E24, and Metric Sonic Combination wrenches include sizes from 6mm to 24mm. Finally, eight 75-degree offset box-end wrenches cover 16 different sizes from 6mm to 23mm. If you need a complete metric wrench kit, this is the one for you.