The PHB described the Climbers Kit by saying (p.151, emphasis mine):
A climber's kit includes special pitons, boot tips, gloves and a harness.
What makes these pitons special, and how are they different from the pitons contained in the Burglar's Pack or Dungeoneer's Pack?
In an non-gaming (real world) reference on pitons, the only significant difference between types of pitons is whether or not they are reusable (e.g. removable from rock without deformation after being hammered into a crack or crevice). Is it unreasonable that the "special" pitons are reusable, while the pitons in the Burglar's or Dungeoneer's Pack are single use?