Pivot barrels for screwing scales down or pivots for folders.
#30 drill recommended for .125 barrels. Specifications .125 (1/8)" = .5 long x .125 +- .001" diameter Thread = 2-56 Material = 416 Stainless
SS Flathead 2-56 .250 screws Torx T6, head diameter = .154", Head height = .061"
SS Buttonhead 2-56 .250 screws Torx T6, head diameter = .1