Three-Way Wrench T10, T15, T25 Torx

Rotor bolts. Small chainring rivets. Shifter clamps with star-recess heads. The fastener cluster you reach for first when a bike's stopping power, shifting, or cockpit needs adjustment, all on a single Y-handle that spins each size in one rotation.

The three-way (Y-handle) format puts T10, T15, and T25 at 120-degree spacings around a central pivot. Each tip is on its own dedicated arm, so you're never chasing the right size in a bit holder or hunting for a separate driver. The Y-geometry also gives you a third axis of leverage: pull on two arms while the third sits in the bolt, and the tool rotates without slipping.

The shanks are chrome-vanadium steel, hardened and tempered, with black-oxide tips for corrosion resistance and a tight fit into Torx recesses. The handle is glass-fibre-reinforced polypropylene, light enough to be quick between fingers and durable enough to live on a workshop bench.

What it's for

T10 lands on small electronic-shifter fasteners and some derailleur cable-anchor bolts. T15 covers SRAM brake-lever clamps on some models and chainring rivet hardware. T25 is the size that built modern disc-brake maintenance: every 6-bolt rotor in the industry uses six T25 bolts in a hexagonal pattern. If you ride disc brakes, the T25 arm on this tool will see the most use of any single driver in your kit.

Specs

• T10, T15, T25 Torx sizes on a three-arm Y-handle
• Chrome-vanadium steel shanks, hardened and tempered
• Black-oxide tip treatment for corrosion resistance and Torx-recess fit
• Trivalent chrome plating to ISO 1456:2009 on the non-tip shank surfaces
• Glass-fibre-reinforced polypropylene handle
• 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 three-way wrench's Y-handle geometry isn't a one-off cosmetic choice; it's the same construction Unior uses across the pro-shop hex and Torx line, with the same chrome-vanadium shank and black-oxide tip treatment. The consumer Y-handle isn't a downgraded version of the shop set; it's the shop set in a Y-handle format.

Pro tip from our mechanics

When you reach for T25, you're almost always on a rotor bolt. The torque spec from rotor manufacturers usually lands at 5–6 Nm, which is tight enough that a Y-handle's leverage will easily overshoot if you crank on it. Snug it down with the Y-handle, then finish with a torque wrench and the matching Torx bit if you want to hit the published spec exactly.

For more on when T10, T15, and T25 are the right call vs. T30 (which lives on most modern chainring bolts) and the T20 / T27 / T30 sizes that show up less often: Hex and Torx wrenches: how to pick the right tool for the job →.