Whether you’re tightening brake calipers or assembling furniture, the 3/8 in. Drive Metric Hex Bit Socket Set delivers the dependable grip you need. Machined from high-strength S2 steel to prevent twisting and deformation of the socket under high loads, these sockets are designed for long-term service. The permanently stamped size markings are easy to read and won’t fade away. This includes the following popular sizes: 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, and 10 mm.