Metallics TP328SFC Screws 8-32 x 3/8 FH Span TR MS USA 1 (100 pcs)

It takes a spanner bit, sometimes called a snake-eye or pig-nose bit, with two round pins that drop into the two holes in the head. A flat blade will not drive it reliably and a Phillips will not engage at all. Buy the spanner bit in the matching size before the install, otherwise the screws cannot be set or removed.

Yes, it is a flat head screw, so the head seats down into a countersunk or chamfered hole and finishes flush with the plate face. If your plate or bracket has a straight, uncountersunk hole, a flat head will stand proud and a pan or round head would be the better pick.

Spanner heads are a tamper-resistant choice for public or shared spaces, where you do not want cover plates, device plates, or enclosure panels opened with a pocket screwdriver. The 8-32 thread and 3/8 inch length match standard electrical device hardware, so you get the same fit as the slotted screw you are replacing but with a drive almost nobody carries in their pocket. For back-of-house or private areas where staff need quick access, a conventional slotted or combo head is less of a nuisance.

It is a machine screw. It needs an existing tapped 8-32 hole or a nut to thread into, and it will not cut its own threads in sheet metal or drywall. If you are fastening into unthreaded material, you need a self-tapping or sheet metal screw instead.

100 pieces per pack. That is enough to do a full floor or wing of devices in one order, which is how most property managers and MRO buyers handle a tamper-resistant changeover rather than buying plate by plate.