This 17-piece Multi-Fit Socket Set features a Go Thru Ratchet. It includes 13 sockets in various sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, and 24mm. The set also comes with a 75mm extension, a 3/8 inch drive adaptor, and a 1/2 inch drive adaptor. The multi-fit sockets are designed to drive Metric and SAE nuts, as well as Star type fixings. The set is made from Chrome Vanadium.