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Improved:

Sights equipped with glowing dots make nighttime and low light shooting easy and accurate compared to instinctive shooting with standard black sights. Traser® luminous, 3-Dot tritium lamps are rugged and heavy duty, and provide a long-lasting energy source. These lamps are mounted in silicone-sealed metal cylinders to protect them from breakage or leakage. Consequently, polished sapphire crystal windows produce a bright, crisp, and round aiming dot in low light. In daylight, the sapphire inlaid with white rings gives the sights a standard white dot appearance. However, very narrow blades lack these white rings and appear as plain black blades in daylight. They can be installed in factory dovetail or sight base for most models, but tenon, staked, and 1911 models necessitate special Trijicon installation tools to prevent damage to the sight.