Sonic wrenches are made from Chrome-Vanadium steel for strength and resistance to the elements and chemicals. Hinged socket wrenches offer the benefits of a ratchet and socket with a different size on each end. Seven wrenches cover metric sizes from 6mm to 19mm. Twelve reversible ratcheting wrenches include a reversing lever to change directions without turning the wrench over. Sizes include 8mm to 19mm. Flare-nut wrenches from 8mm to 27mm, and Star wrenches in sizes from E6 to E24 complete this Sonic 30-piece wrench set.