Nighthawk Custom Custom Fully Adjustable Night Pyramid-Shape Rear Blade w/Two Dot. Two .077 Trijicon tritium inserts are outlined in white to make sight acquisition in both daylight and night scenarios a breeze. The square shape of the target sight blade includes rounded edges necessary for carry use without sacrificing sight picture. The rear of the sight features serrations to eliminate glare from light sources while aiming. Some fitting may be required Specifications for Nighthawk Custom 1911 Fully Adjustable Two-Dot Rear Sight: Manufacturer: Nighthawk Custom Color: Black Rear Sight Color: Tritium Attachment Type: Screw Rear Blade Height: 0.325 in Illumination Color: White Condition: New Package Contents: Nighthawk Custom 1911 Fully Adjustable Two-Dot Rear Sight Nighthawk Custom SI0048: Custom Fully Adjustable Night Pyramid-Shape Rear Blade w/Two Dot