Tru-dot sights offers a sighting system for improved rapid instinctive aiming which requires no transition from day to night use.Day and night the shooter's aiming reference are three solid dots identical in appearance and location under all light conditions.This model is compatible with glock 20/21/29/30/36/41.Rear Color: OrangeType: Front/Rear SetFrame Material: SteelFrame Color: BlackFirearm Fit: Glock 20-21 29-30 36 41Style: FixedFront Material: TritiumRear Material: TritiumFront Color: GreenWindage Adjustment: NoElevation Adjustment: NoFirearm Type: Handgun