This socket set is crafted from carbon steel, undergoing a precise heat process. This approach supports the ratchet wrench in providing dependable performance for common repair and assembly tasks around the home and auto. Complete Metric Tool Kit: The metric socket set includes 13 1/4"" sockets (4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14 mm), 21 1/4"" bit sockets, 1 ratchet handle, 1 spinner handle, 1 universal joint, 2 extension bar, 1 flexible extension, 1 sliding t-bar, 1 bit adapter and 3 hex wrenches, covering frequently needed sizes. This metric wrench set is for work on automotive fittings, bicycle components, and furniture assembly. You'll find changing bits and sockets straightforward with the ratchet wrench's quick-release button. All your tools in this 1/4 inch socket set have a snug spot in the sturdy, compact case. It's a tidy home for your ratchet set, keeping pieces together so you can find what you need quickly and take your toolkit anywhere. weight: 2.51 pounds.