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 is the official technical partner of multiple World Tour and downhill 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 →.