What is this slot for? It just says open slots

Open Circuit OPEN SLOTS Non

This open-slot wiring duct is an easy way to re-route, reorganize, and conceal cables Improve you cable management with this open-slot wire duct today!

open slot cable trunking This open-slot wiring duct is an easy way to re-route, reorganize, and conceal cables Improve you cable management with this open-slot wire duct today!

open slot meaning On your computer, open Google Calendar · Go to Settings and then General and then Appointment schedules · Select or deselect the box next to Create appointment