The Mammoth Top Sub is a short length of drill collar that has male threads on one end and female on the other. It is screwed into the bottom of the top drive (rotary head) or shock sub and onto the drill rod. It serves as a crossover between the top drive (rotary head) or shock sub connections and the rod connection.

The Mammoth Bottom Sub is a short length of drill collar that has male threads on one end and female on the other. It is screwed onto the bottom of the drill rod and onto the drill bit. It serves as a crossover between the drill rod connections and the bit connection.

- Drill manufacturer
- Drill model
- Drill rod diameter
- Shoulder to shoulder length
- Actual thread size
- Spanner flat position