COSMIC XL NI-136 2 1/4" diameter aperture Features: * Exclusive 20 inches of 0.030" light gathering fiber optic * Collects and directs every bit of available light to the tip of the pin to make that critical shot in legally low light conditions * CNC machined aluminum components & Polycarbonate aperture * Rotate the Cosmic Ring to have 4 different up, down, right or left positions * Exclusive leveling system available * Patent no. 6601308 Optional Accessories * NI-036 Level * NI-051B Blue Light * NI-084 or 085 Lens Adapter * Glass & Polycarbonate Lens 2X, 4X, & 6X