What are these? These hardened steel dies (nuts) drop into any skate tool or wrench for that matter and allow you to "chase" (re-thread) your damaged axle ends or kingpins. The carabiner is a handy way to keep track of these dies as you are sure to become the most popular person at every session when you are rockin these. Includes a carabiner, axle re-threader due, and kingpin re-threader die.