Three-Way Wrench 4, 5, 6mm Ball Tip Hex

Stem face plates behind the bar bend. Water-bottle cage bolts shrouded by a rear rack. The bolts on a bike where straight-on access is blocked, on a Y-handle whose ball-tip ends engage the bolt at an angle.

The ball-tip geometry lets each arm engage the hex recess at up to about 25 degrees off-axis. That's the geometry that makes a ball-end wrench the right tool for finding a bolt and breaking it loose when a frame, cage, or component blocks straight-on access. The three sizes on this Y-handle (4, 5, and 6 mm) are the most common medium-hex sizes on a bike, which is why this is the angled-access tool most likely to live on a workbench rather than in a drawer.

The shanks are chrome-vanadium steel, hardened and tempered, with the ball-tips finished to a precise spherical radius. The polypropylene handle balances the three-way geometry; you can spin a bolt with one arm in the recess and two arms rolling between your fingers, while the ball-tip lets you do that from an angle a straight-tip wrench would refuse.

What it's for

4 mm hex covers stem face-plate bolts on many bars, brake-lever clamps, and the bottle-cage bolts most road and gravel frames use. 5 mm is the size for stem steerer-clamp bolts, seatpost binders, and saddle-rail bolts on most clamps. 6 mm shows up on disc-brake caliper-mount bolts and some chainring bolts on older designs. The ball-tip format earns its place anywhere the bolt sits behind something the driver can't pass through: behind the bar bend, behind a rear bottle cage, between a frame stay and a crank arm.

Specs

• 4, 5, 6 mm ball-tip hex sizes on a three-arm Y-handle
• Chrome-vanadium steel shanks, hardened and tempered
• Black-oxide tip treatment for corrosion resistance
• Trivalent chrome plating to ISO 1456:2009 on the non-tip shank surfaces
• Glass-fibre-reinforced polypropylene handle
• Ball geometry engages bolts at up to about 25 degrees off-axis
• 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 ball-tip cluster uses the same construction as the straight-tip Y-handle in the line, with the ball geometry machined to the same tolerance band the pro-shop hex set ships to.

Pro tip from our mechanics

Ball-tip is the right tool for finding a bolt at an angle and breaking it loose. It's the wrong tool for the final torque pass. Once the bolt is in the recess and turning freely, switch to a straight-tip Y-handle or a T-handle for the snug-down: the ball-tip's contact patch is small, and concentrated torque on a small patch is exactly the geometry that rounds the recess flats.

For the line between ball-tip and straight-tip, the working-torque threshold our shop uses to decide between the two, and when the 4 / 5 / 6 mm cluster needs a torque-wrench bit instead: Hex and Torx wrenches: how to pick the right tool for the job →.