These are black oxide coated steel pan head screws with Phillips drive. These are commonly used for TMLAB replacements and for upgrades to holster and sheath mounts. These are heavy duty and are hard to find.
Specifications
Length = .750 (3/4) (from under head surface)
Head Diameter = .312
Phillips Drive
Black Oxide Coated
Sold Individually
(1 QTY = 1 Screw)