9-piece Long Ball End Hex Wrench Set

Ball-end hex wrenches solve the bike-shop access problem that flat-end wrenches cannot: fasteners that are partially blocked by adjacent components and can only be approached at an angle. The ball-shape on the long arm lets the wrench engage the bolt recess at up to 15 degrees off-axis, which is the difference between reaching a fastener through a tight chainstay yoke and removing the bottom bracket to access it.

What’s in the set

Nine ball-end hex wrenches, sized to bike-shop work:

• 1.5 mm
• 2 mm
• 2.5 mm
• 3 mm
• 4 mm
• 5 mm
• 6 mm
• 8 mm
• 10 mm

The same nine-size range as the flat-end set, in a matching plastic clip-index.

When the ball end earns its keep

• Reaching a fastener that’s not square-on. A stem-bolt accessed through a handlebar bag, a brake-caliper bolt behind a chainring, a derailleur clamp bolt that’s angled to the seat tube.
• Starting a fastener you can’t get straight access to. Engage at angle, run the bolt down most of the way with the ball end, then switch to the flat-end set for final torque.
• Working in cluttered drawer cabinets where the L-shape itself can’t pivot into the workspace.

The 15-degree tolerance is the geometric advantage. Beyond about 15° the tip starts to cam out of the recess and risks rounding the bolt head; that’s a useful limit to internalize when you’re tempted to push the angle.

The flat-end trade-off

Ball-end tips lose some torque capacity compared to flat tips. The reason is the contact patch: a ball tip engages the bolt recess at a smaller area than a flat tip, which means more stress per unit area on both the tip and the bolt. For final-torque work and breaking stuck fasteners, switch to the flat-end set. Most shops own both and split the work: ball-end for initial cycle and angled access, flat-end for the final torque application.

Specs

• Sizes: 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10 mm
• Tip style: ball-end (on long arm), flat (on short arm)
• Maximum engagement angle: approximately 15 degrees off-axis
• Handle style: long-arm L-shape
• Storage: plastic clip-index
• Dimensional standard: DIN 911

Made in Slovenia, since 1919

Unior has been forging hand tools in Zreče since 1919, and sponsors professional road and mountain-bike race teams. Forming the ball end while keeping the dimensional fit inside the hex recess is the harder manufacturing problem; a poorly-formed ball end cams out of the recess earlier than 15° and rounds the bolt. The grinding process on our ball tips is calibrated for the full angular range; that’s the metallurgy choice behind the tool’s geometry.

Pro tip from our mechanics

A ball-end wrench is the tool that turns “I need to pull this component to reach the bolt” into “I can reach it through the existing access.” Once you own a set, the angled-access workflow becomes habit. For the framework on which wrench type fits which job: Hex and Torx wrenches for bike work →.