Spark III brings HIVIZs ingenious interchangability to one of the brightest, most economical sights on the market. This big, bright dot is 0.090 in diameter, and comes with red, green, and white LitePipes, bringing affordable accuracy to any shotgun. Fits most vent-ribbed and plain barrel shotguns with removeable front bead. Sight includes five screws in varying thread sizes to fit nearly any shotgun: 3-56; 5-40; 6-48; 3mm x 0.5; 3mm x 0.6.