Product - 5966 Rear ghost ring and notched rear sight/standard front sight The industry's standard for fiber optic turkey sights Universal mounting system for ventilated rib shotguns Full windage and elevation adjustment CNC machined Front diameter is .060 inches and rear diameter is .035 inches Endorsed by the National Wild Turkey Federation Includes hardware Made in the USA Weight: Approximately .07 poundsShipping Dimensions: Approximately 7 x 4 x 1 inches.