1/4" Socket Set on Rail

This is the 1/4-drive socket selection without the ratchet, extensions, or T-handle. Twelve metric sockets on a storage rail, sized to the bike-shop fastener range. The right choice when you already own a 1/4-drive ratchet and want a fuller socket selection than your existing set covered, or when you want a backup set for a second toolbox.

What’s in the set

Twelve sockets in metric sizes:

• 4 mm
• 4.5 mm
• 5 mm
• 5.5 mm
• 6 mm
• 7 mm
• 8 mm
• 9 mm
• 10 mm
• 11 mm
• 12 mm
• 13 mm

The storage rail clips the sockets in size order, which is the small organizational decision that turns a set from “I think the 8 is here somewhere” into a tool you can grab and replace without thinking.

When this set is the right answer

• You already own a 1/4-drive ratchet. Buying another full set with a redundant ratchet wastes shelf space.
• You need a wider socket range than your existing set covered. This 12-piece adds the 12 mm size that some kits skip.
• You’re stocking a second bench or a travel kit. A standalone socket rail is easier to grab than a full tray.

Where the 1/4-drive sizes land in bike work

The 4–13 mm range covers the low-torque end of bike service: derailleur cable-pinch nuts, brake caliper mount nuts, small accessory fasteners, and so on. For higher-torque fasteners (pedal axle, cassette lockring, crank-arm bolt) you’ll want 3/8 or 1/2-drive sockets in matching sizes.

Specs

• Drive size: 1/4 inch
• Socket count: 12 metric
• Socket range: 4 mm to 13 mm
• Storage: clip rail
• Construction: chrome-vanadium steel, hardened and tempered

Made in Slovenia, since 1919

Unior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. The socket walls are sized to industry standard DIN 3120 tolerances, which is the spec that determines whether the socket fits a fastener head squarely or rocks off-center. Off-spec sockets round corners on softer alloy nuts; the DIN tolerance is what keeps the wear at zero.

Pro tip from our mechanics

A clip rail is the most underrated organization tool in a small bike shop. Pair this set with the 1/4-drive socket set with ratchet if you don’t already own a 1/4-drive ratchet. For the framework on which drive sizes belong where: Sockets and bits for bike work →.