PREMIUM MATERIAL & BUILD: Made from tough Chrome Vanadium Steel with a corrosion-resistant black phosphate finish, this 78-piece impact extension set is built to last. All bits are crafted from high-strength S2 steel for reliable performance under heavy torque—perfect for mechanics, technicians, and serious DIYers. 57 IMPACT BITS : Get everything in one go: 57 impact-rated bits in 1/4" and 5/16" sizes—Slotted, Phillips, Pozidriv, Hex, Torx, and more. Whether you’re repairing electronics, working on vehicles, or tackling industrial bolts, these S2 steel bits offer true extension set flexibility. EXTENSIONS, ADAPTERS & COUPLERS FOR EVERY ANGLE: Includes 8 socket extensions (1/4", 3/8", 1/2" drives in 3", 6", and 10" lengths), 4 impact socket adapters, 3 universal joints, and 3 couplers—everything you expect in a socket extension set or ratchet extension set. Perfect for tight spots, changing drive sizes, and converting screwdriver bits. Plus, 3 bonus hex-to-drive adapters let your drill handle sockets like a pro. EASY IDENTIFICATION & EFFICIENT WORKFLOW: All extensions, adapters, and bits are clearly size-marked, so you can quickly find the right tool. Whether it’s a 3/8 extension set or a socket adapter set, you’ll spend less time searching and more time getting the job done. HEAVY-DUTY STORAGE CASE: The blow-molded carrying case keeps all 78 pieces securely in place for organized storage and effortless portability. KOOPOOL tools exceed ANSI standards, ensuring quality and reliability on every job. 78-Piece Impact Socket Extension Set, 1/4", 3/8" & 1/2" Drive, Includes Socket Adapters, Ratchet Extension Bars, Swivel Joints, Couplers & 57 Impact Bits