This HIVIZ Folding AR-15 Tritium Picatinny Backup sight set is designed for the roughest use and is the perfect addition to any tactical platform. When choosing backup sights, they must be durable, reliable, and visible regardless of lighting conditions. FeaturesSpring loaded, flip-up sight setBrightest, fully encapsulated Tritium front sight postDual aperture rear sightUses Magpul sight basesAdjustable for windage and elevation (adjustment tool included)