This threaded, front bead replacement, Spark III shotgun sight from HIVIZ is interchangeable style, and includes red, white, and green, fiber optic family LitePipes. Each Spark III is packaged with five threaded studs (6/48, 3/56, 5/40, 3mm x .5, and 3mm x .6), to fit most common shotguns with a removable front bead. Notes:LitePipe Diameter: 0.090"Overall Height: 0.160" FeaturesImproves visibility is all lighting conditionsInterchangeable LitePipesFits most shotguns with removable beads