Nylon Key-Slot B Posts

What cases to use slotscutouts in PCB and based on which pcb slot Slot Pcb Price pcb slot connector PCB Storage Weight 6 Kg Guide slot Depth: 3 mm, Width: 5 mm Fix method ScrewGear Specifications Material Metal ; Surface resistance

rocket 777 slot So is it plated board edge, or slot inside of the board? In both cases, expect price extra