HP 693485-001 external plastics kit is a set of exterior chassis parts listed for the HP Z820 and Z840 workstations. It is intended for replacing or restoring the listed external plastic pieces on those systems.
The kit includes front upper vents, upper vents, front and back-panel chassis handles, top-left and top-right trim pieces, and chassis-bottom trim feet. These parts cover several areas of the exterior, so the kit brings those components together under one part number.
Mounting screws are included. The listing describes this as an external hardware plastics kit; it does not specify dimensions or material details.