These are the individual pieces a machine guarding system is built from, not standalone guards. Posts, wire mesh panels, and door kits belong here because most people looking for them already have guarding in place and need to add a bay, change a run, or replace a piece that took a hit.
A guarding run comes down to posts and panels. The posts set the spacing and carry the panels between them, and the mesh panels are the barrier itself. Door kits are how people and equipment get through the run: a hinged door swings and needs clearance to open, a sliding door travels along the run and is the usual answer where there is nothing to swing into.
If you are specifying an enclosure from scratch rather than adding to one, start on the Machine Guarding page and we will work back to the component list from there.