I found this info from google, it says “ A Springlock suit is a special animatronic that can be used as both an animatronic and suit, to turn the animatronic into “suit mode”, you will require a special crank which expands the endoskeleton enough to fit a person inside, the 2 most noticeable springlock suits are Springtrap AKA Springbonnie and Fredbear.”