These are black oxide coated steel flat head screws with Phillips drive. These are commonly used for TLMAB replacements and for upgrades to holster and sheath mounts. These are heavy duty and are hard to find.
Specifications:
Length = .500 (from head surface)
Head Diameter = .290
Phillips Drive
Black Oxide Coated
Sold Individually
(1) QTY = (1) Screw