The key grip is the chief grip on a set, and is the head of the set operations department.
The best boy is chief assistant to the key grip. They are also responsible for organizing the grip truck throughout the day.
Set Ops Grips
Grips build and maintain all equipment that supports cameras, helping to position and move cameras smoothly and safely.
The grip in charge of operating the camera dollies and camera cranes is called the dolly grip.
The construction grip helps to build and break down sets and to unpack and pack parts of sets from storage.