Olivon 2" Mirror Star Diagonal. Fully Multi-Coated 2" 90° diagonal with 1.25" adapter included. Lightweight, all aluminum construction. Uses 99% Reflective Dielectric coatings. Premium grade, thick, precision, optical flat mirror-based diagonal for all 2" and 1.25" focusers and eyepieces. The Olivon 2" 90° Mirror Star Diagonal utilizes a non-marring compression ring fitting to protect your eyepieces from scratching. 2 inch mirror diagonal. Fully Multi-Coated. 1.25 inch adapter included. Compression ring to protect eyepieces.