The ameriglo i-dot sight set replaces the factory sights and utilizes a dot over dot configuration.These sights are designed for quick sight alignment in low light conditions.The front sight is a single tritium dot with an orange outline.The rear sight is a single green tritium dot with with a white outline.Rear Color: Green w/White OutlineType: Tritium Front/RearFrame Material: SteelFrame Color: BlackFirearm Fit: Glock 20/21/29/30/31/32/36/41Style: SetFront Material: TritiumRear Material: TritiumFront Color: Green w/Orange OutlineWindage Adjustment: NoElevation Adjustment: NoFirearm Type: Pistol