Features: 13pcs hexs socket bit set, include 6pcs 1/2inch hex sockets, 1pcs drill chuck, 2pcs adapters, 2pcs aprons and 2pcs bolts. Manufactured from 45# steel, with heat treated for extra strength and durability. Precise bits to ensure accurate size, includes: 14mm, 17mm, 18mm, 19mm, 21mm, 22mm. Different size can meet your daily needs for various kinds of repairing work. It can be used with bend/ratchet wheel/pneumatic wrench. Hardened and tempered, professional tool for commercial or occasional use. Useful tool kit for automobile repairing and maintenance.