HiViz threaded, front bead replacement, Spark III shotgun sight 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. The Litepipe Diameter is 0.090 Inch and the overall height is 0.160 Inch. HiViz sights is proud to introduce the new Spark III shotgun sight. For years the Spark sight has been our most compact and economical bead replacement. The Spark III has several improved features from the Spark II. The foremost improvement is the addition of interchangeable Litepipes with a viewing diameter of .090". Now you can choose from our bright HiViz green or the Fire red and we have also included a white Litepipe for those who want a more traditional look. The sight base is all steel constructions. We have improved the Litepipe to be brighter than the original Spark making the new Spark III the brightest most economical interchangeable shotgun bead on the market. All HiViz products are covered against defects in materials and workmanship for a full year..