The TRUGLO Fat Bead Dual Color Fiber Optic Shotgun Sight effectively gathers all available light to provide a fat, glowing dual color bead to help you get on target fast. As you focus on the target while the shotgun swings, the fiber optic sight is much easier to see in your peripheral vision than a conventional brass or ivory bead. Specifications and Features: TRUGLO TG948CD Fiber optic Dual color red/green 2.6mm threads