The Trijicon 601110 DI Night Sight Set delivers proven Trijicon engineering for Smith & Wesson M&P Shield and Shield Plus frames, including .40, .45, and 9mm variants as well as M2.0 models, with a front Green Tritium fiber optic and a Black Outline rear sight designed for fast, daylight-bright aiming in any light. Building on decades of cutting-edge aiming technology, these DI Night Sights feature an industry-first interchangeable fiber using a patent-pending design that lets you swap colors in the field and tailor your sight picture to your environment and preference. The dual-illumination system blends a rugged fiber optic core with a tritium lamp capped by a sapphire jewel, providing an ultra-bright, constant aiming point from daylight through low light to complete darkness. The result is a durable, reliable sighting solution that remains sharp and repeatable under duty, competition, or personal defense scenarios, offering daytime brightness when you need it and a dependable glow when light fades. Professional installation is recommended to ensure optimal sight alignment and performance.