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A hex wrench with measuring function from the tip, allowing length, depth and adjustment width checks up to 110mm. Available in 4mm, 5mm and 6mm sizes.
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The Runwell MEX 4 / 5 / 6 Hex Wrench is a bicycle maintenance tool that combines a hex wrench with a measuring function. It is suitable for everyday bike maintenance, component installation, bike assembly and workshop use.
A standard hex wrench is mainly used for tightening and removing bolts, but during maintenance, it is often useful to check length, depth or adjustment width. The special feature of the Runwell MEX is its built-in measuring scale, which starts from the tool tip. This allows you to check dimensions more intuitively during work without repeatedly reaching for a separate ruler.
The measuring range reaches up to 110mm, making it useful for saddle height adjustment, component positioning, bolt depth checking, spacing confirmation and other quick measurement tasks. For mechanics, bike builders or riders who enjoy maintaining their own bikes, it is a practical small tool with thoughtful functionality.
The MEX series expands the maximum wrench size into both inner sides of the tool, making it easier to check dimensions during work. This makes it more than just a hex wrench—it becomes a multi-purpose tool with an added measuring function.
Available in 4mm, 5mm and 6mm, the sizes cover common bicycle maintenance needs. 4mm is often used for smaller parts, seat clamps and some cockpit components. 5mm is one of the most commonly used bike repair sizes. 6mm is often used for larger bolts or certain crank, pedal and component fixing points. You can choose a single size based on your needs or add them to a workshop tool setup.
If you are looking for a hex wrench that can also help with quick measurement during maintenance, the Runwell MEX is a clever and practical choice.
⚠️ Please note: this product includes one hex wrench only. Please select 4mm, 5mm or 6mm according to your needs.
⚠️ Other wrench sizes, tool bags and display props are not included.
⚠️ Always confirm bolt size and tool compatibility before use to avoid stripping bolts or damaging the tool.
⚠️ When tightening bicycle components, follow the recommended torque values to avoid over-tightening.
Key Features
Specifications
Brand: RUNWELL
Product Name: MEX Hex Wrench
Color: Black
Size: 4mm / 5mm / 6mm
Length: 145mm(4mm)/ 165mm(5mm)/ 185mm(6mm)
Weight: 17.5g(4mm)/ 31g(5mm)/ 50g(6mm)
Measuring Range: Up to 110mm
Certification: ISO9001
Made in: Japan