CK Tools C8432 is a set of socket tools designed for professionals. It contains 12 metric 3/8-inch drive socket sizes – 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, and 22mm. It is made of high-grade Cr-V steel, finished with an advanced black phosphate coating. These sockets are ideal for professional automotive mechanics and engine tuners as well as general DIY use. It also comes with a special 3/8-inch bit adapter for quick changes.