KLEIN TOOLS Folding Hex Wrench Set — 11 SAE Extra-Long Blades, Heavy-Duty Reinforced Handle

The Klein Tools 70550 is an 11-piece heavy-duty folding hex key set with extra-long SAE blades and a reinforced handle for comfortable, high-leverage access in tight or deep fastener locations.

Built for tradespeople and serious DIYers, this compact folding tool combines long-reach hex keys with a rugged nylon body and heat-treated alloy-steel blades. The set organizes the most frequently used SAE hex sizes into a single, portable tool while providing squared ends for full-depth engagement with fasteners. A built-in #2 Phillips fastener lets you adjust tension on the outer body, and the blades open independently up to 270 degrees so you can position the working key where you need it.

How do these extra-long blades help on deep or recessed fasteners?

The 4-inch-range blades give you reach beyond standard short keys, letting you get into recessed sockets and behind obstructions without relying on extensions. Longer blades also improve access when components or housings surround the fastener.

• Blades approximately 3.5"–4.5" let you reach deep-set bolts.
• Square-cut ends maximize contact to reduce cam-out and stripping.
• Independent opening up to 270° for flexible positioning in tight spaces.

Is this set durable enough for professional daily use?

Yes. Klein Tools designs this folding hex set with heat-treated alloy-steel blades and a reinforced nylon handle to endure frequent jobsite use. Components and construction aim to withstand leverage and repeated cycles without premature wear.

• Heat-treated alloy-steel blades for strength and longevity.
• Reinforced nylon handle for impact resistance and a secure grip.
• #2 Phillips tension fastener allows on-the-spot adjustment and maintenance.

Which hex sizes are included and how does the set stay organized?

The 11 SAE sizes cover the most commonly used hex key dimensions for mechanical, electrical, and maintenance tasks. Keys are retained in the folding handle in a logical sequence so you can quickly select the right size without carrying separate L-keys.

• Included sizes: 1/2", 3/8", 5/16", 1/4", 7/32", 3/16", 5/32", 9/64", 1/8", 7/64", 3/32".
• Color-coding across Klein’s product family aids quick visual identification on mixed-tool benches.
• Compact folding design keeps keys secure and reduces pocket clutter.

How easy is it to use and maintain this folding hex wrench set?

The ergonomic handle and independent-opening blades make it simple to deploy a single key or use the tool like a small multi-bit wrench. Maintenance is straightforward: tighten or loosen the outer Phillips fastener to adjust hinge tension and keep blades operating smoothly.

• Comfort grip handle reduces hand fatigue during repeated turns.
• Phillips fastener provides quick tension adjustments on the go.
• Open blades fold back into the handle for safe storage and transport.

Who is this for: The Klein Tools 70550 is made for electricians, mechanics, maintenance technicians, and serious DIYers who need durable, long-reach SAE hex keys in a single, portable tool. If you frequently work with recessed fasteners, service equipment with limited access, or want a robust folding hex set that holds up under daily jobsite demands, this 11-piece Klein set is built to deliver reliable performance.