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" diameterThread = 2-56Material = 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 = .150" Head height = .043" .187 (3/16)" = .5 long x .1875 diameterThread = 6-32Material = 303 Stainless SS Flathead 6-32 .250 screws Torx T10, head diameter = .230" Head height = .080" SS Buttonhead 6-32 .250 screws Torx T10, head diameter = .257" Head height = .070" SS Sockethead 6-32 .250 screws Torx T15, head diameter = .217" Head height = .074" .250 (1/4)" = .5 long x .250 diameterThread = 8-32 All pivots are heat treated for low wear. Material = Stainless SS Buttonhead 8-32 .250 screws Torx T10, head diameter = .302" Head height = .082"