These are black oxide coated steel flat head screws with Phillips drive.
They have a smaller diameter head than our standard screws to allow them to recess into the IWB post so that it is easier to snap and unsnap the IWB.
These are commonly used for upgrades to holster and sheath mounts.
These are heavy duty and are hard to find.
Length = .375 (from head surface)
Head Diameter = .225
Black Oxide Coated