The plastic screw standoffs in 360 controllers are often prone to breaking through misuse or the plastic ageing.

These replacements are designed to fit over the remaining parts of the standoff and be glued in place.

I would recommend a test fit before gluing to ensure the controller still closes flush. Trim or sand the parts to fit. I normally use a Dremel with a cutting wheel to grid down the some of the remnants of the middle standoff in particular.

PLA with super (CA) glue produces good results. Beware the glue expanding if using a spray accelerator. You may also wish to cut the threads with a screw before gluing in place. Print with supports.