Derailleur Cage Tool Set

   Check out this cool tool set made from a rear derailleur: 

Derailleur cage tool set

   Let me drop some knowledge on you - the cage is the lowest part on the rear derailleur and holds the derailleur wheels. It is responsible for chain tension:

Derailleur cage

   Here's what a normal boring tool looks like:

Bike tool

   I don't know if it's actually a recycled cage or built to look like one - but it's super cool in any case!