Trijicon DI Night Sight Retainer Set Interchangeable Black Frame Trijicon DI Night Sights feature a chemical and heat resistant fiber, finished with the same proprietary technique as the Trijicon ACOG, coupled with a tritium lamp capped with a sapphire jewel. This dual-illumination technology amplifies collected light, ensuring an ultra-bright aiming point in any light from daylight-bright to low-light to complete darkness. This kit includes 1 ea. white, orange and yellow retainer and a torque L-key.