All Sonic wrenches are made from Chrome-Vanadium steel that offers a lifetime of durability and resistance to weather and chemicals. Standard Sonic Combination wrenches provide one open-end and one box-end and include sizes from 6mm to 32mm. Double Open-end wrenches offer two sizes for each wrench from 6mm to 27mm. Eight 75-degree offset box-end wrenches cover 16 different sizes from 6mm to 23mm. Finally, two Flare wrenches complete this kit with a different size on each end, covering 8, 10, 11, and 13mm. Get your Metric wrench fill with just this one Sonic 41-piece set.