What are the most common 3mm hex fasteners on a bicycle?

Rear derailleur cable anchor bolt, brake cable anchor bolts, some brake pad positioning screws, Garmin/Wahoo computer mount screws, and various accessory interfaces.

Can I use 3mm for electronic groupset fasteners (Di2, eTap, Force AXS)?

Yes — most electronic groupset wire port covers and junction box mounts use small hex fasteners in the 2–3mm range.

IceToolz

Icetoolz 3mm TwinHead Hex Key Wrench

Name: Icetoolz 3mm TwinHead Hex Key Wrench
Brand: IceToolz
SKU: CMB_EAS_4718152722300
Price: 450.00 INR
Availability: InStock
Author: InstaSport Editorial

₹450.00

Description

The IceToolz 3mm TwinHead Hex Key is the precision instrument for small-fastener bicycle maintenance. 3mm hex bolts are used on shifter cable pinch bolts, brake pad positioning screws, and various accessory mounting interfaces. The ball-end TwinHead format is particularly valuable at 3mm where acces