Metric Hex Key, Straight-Tip, Long

The long-arm L-key in a single size, sized individually. The format that gives you the reach to engage deep-recess fasteners and the leverage to deliver high working torque on the long arm, in a straight-tip geometry that engages the bolt on the full hex flat. Available across the bike-relevant metric hex sizes the 220/3L line covers.

The long L-key extends the short L's geometry by giving the long arm the length to deliver high working torque comfortably. A 5 mm hex bolt that needs 12 Nm of working torque is at the edge of a short L-key's range; a long L-key with the same 5 mm tip handles 15 Nm without the user fighting the tool for the last few degrees of rotation. The straight-tip format engages the bolt on the full hex flat, so the leverage gain on the long arm gets transmitted through clean contact rather than through the small contact patch of a ball-tip.

The shank is chrome-vanadium steel, hardened and tempered. The tip is black-oxide for corrosion resistance and a clean fit into the hex recess. The non-tip shank surfaces are nickel-plated for additional corrosion resistance. The size is laser-etched onto the shank so the size-to-tool match is permanent rather than worn off by repeated use.

Why buy individually

The 4, 5, 6 mm sizes wear faster than the rest of the line because they see the most engagements; replacing a single worn long L-key costs less than buying a fresh set every time one size's tip rounds. The 220/3L line is sized to let a working shop or a home mechanic keep duplicates of the most-used sizes on the bench, in addition to a full set, without doubling the spend.

Specs

• Single-size long-arm L-key hex wrench (size selected at order)
• Chrome-vanadium steel shank, hardened and tempered
• Black-oxide tip treatment for corrosion resistance and recess fit
• Nickel plating on the non-tip shank surfaces for additional corrosion resistance
• Manufactured to the ISO 2936 dimensional standard for metric hex keys
• Manufactured in Slovenia

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The long L-key is the format the shop uses when leverage matters more than packing; the construction is the same chrome-vanadium shank and black-oxide tip treatment as the short and ball-tip L-keys in the line, on a longer arm geometry.

Pro tip from our mechanics

The long L-key's natural use case isn't speed; it's leverage. For a fastener that needs to be tight enough to hold a slipping interface (seatpost binder, stem clamp), the long-arm pull delivers the torque a T-handle's cross-bar grip can't comfortably reach. Where the T-handle is the speed tool, the long L-key is the leverage tool; both formats earn their place in a workshop set.

For the working-torque thresholds where a long L-key beats a T-handle, and the size cluster where the long format earns its bench space: Hex and Torx wrenches: how to pick the right tool for the job →.