These are Fan Shield . Fan Grill . Finger Guard Protection

Dimensions

152mm / 6 Inch Area Diameter
158.75mm / 6.25 diagonally between screw mount holes

These fan shields were previously owned by Hewlett-Packard Agilent Keysight and were purchased in 2004. They have been in-store stock at Luddite Electronics in Longmont Colorado and sold here.