Explore Scientific 2in 99percent Reflectivity Diagonal Mirror. The Explore Scientific 2" Reflectivity Diagonal Mirror has a solid construction and is light weight. Just insert or withdraw the Explore Scientific 2in Reflectivity Diagonal Dielectric-Coated Mirror from the focuser to get bright clear images from your telescope. Specifications for Explore Scientific 2in Reflectivity Diagonal Dielectric-Coated Mirror: Length: 104.8mm Width: 60.9mm Height: 127.0mm Weight: 1 lbs; .45kg Package Contents: Explore Scientific 2in 99percent Reflectivity Diagonal Mirror 2-inch 99percent Enhanced Mirror Diagonal; Includes 1.25 Eyepiece Adapter