In Stock, Ships Immediately! 8pc Hex Bit Socket Set with Rail, Applications: Bit sockets used for tightening and loosening hex bolts. ■ Specifications Sizes: 3, 4, 5, 6, 7, 8, 10, 12mm Drive Size: 3/8" (9.5mm) Material: Chrome Vanadium Steel Weight: 420g ■ Notes For hand tools only; do not use with power tools such as impact wrenches. Case may not be included.