The OEMTOOLS 22835 11 MM METRIC HEX BIT SOCKET, 3/8 INCH DRIVE is made of a special heat treated alloy steel (S-2) for additional strength and longevity. And we’ve added an easy to clean Hard Chrome finish for additional rust resistance. Our hex bit sockets won’t get damaged from oil, automotive fluids, or grease. And the chamfered ends on this line of bits and sockets make fastener engagement quick and smooth. These bits make great addition to any socket set, and they’re easy to identify and organize, due to our deep size-identifying markings, and our knurling identification, which uses straight knurling to identify SAE sockets and bits, and cross-hatched knurling to identify metric bits and sockets. These bits are designed to be professional quality, and durable enough for daily use. We know a variety of common and specialty repairs require a good set of hex bit sockets, which is why we’ve designed these to exceed the standards expected by professional mechanics. FULL SPECIFICATIONS: - 11 mm - 3/8 Inch drive - Made with S2 steel bits for durability - Deep marking for easy identification won't wear off with extended use - Cross-hatch knurling identifies this bit as metric for easy organization - Knurling position is optimized for best finger gripping position - Hard Chrome finish is easy to clean, won't show prints and keeps rust away - Chamfered ends on bits and sockets make fastener engagement quick and smooth