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 sponsors professional road and mountain-bike race 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 →.