Spring-loaded plunger and detent, located in the “Masterpiece” Banded Front Ramp, hold the sight blade into the longitudinal dovetail; set screw firmly locks the sight blade in place. Styles available: S-1 - 5⁄64" (1.9mm) and 3⁄32" (2.3mm) diameter silver bead.
Big Book Catalog, Issue:70, Page:281
SPECS: Steel, blued. Base - 7⁄8" (22mm) long, S-4 is ¾" (19mm) long; 7⁄32" (5.5mm) wide. Blade - 9⁄16" (14.3mm) long. Height - shown in chart is from bottom of dovetail to top of blade.