These original Cádomotus wheel axles will not damage your Comp TR3 frame and lock itself due to the specific head design

• CNC-precision machined in 6061 aluminium
• M7x1 threaded (pay attention not to use these axles for non-Cádomotus frames that have M6 thread holes)
• Self locking chamfered head
• Fasten these with a 4mm hexicon

Comp TR3 frame is also part of the Versatile-3 and Agility-3 skates. For those skates you need these axles.