Meprolight Tru-Dot night sights feature unequaled low-light performance as the brightest night sights available. They are trusted by military and law enforcement. This adjustable set features self-illuminated green Tritium in a 3-dot configuration. This model is for use on Glock G17 19 20 21 22 23.Features / SpecsRear Color: GreenType: Front/Rear SetFrame Material: SteelFrame Color: BlackFirearm Fit: Glock 17 19-23Style: AdjustableFront Material: TritiumRear Material: TritiumFront Color: GreenWindage Adjustment: YesElevation Adjustment: YesFirearm Type: Handgun