Truglo BRITE-SITE sight set Glock 20, 21, 29, 30, 31, 32, 37 steel fiber optic Red front, green rear. These high contrast fiber optic sights feature a 3 dot pattern with a single Red front dot and 2 green rear dots. Fiber optic technology lets these lights Gather ambient light and direct it toward the shooter's eyes, making the sights glow bright without the need for batteries. Perfect for all types of daylight shooting.Features:- uses traditional fiber optic technology- CNC machined steel construction- contrasting Red front and green rear- concealed fiber cannot be seen by target- fits standard holsters- snag-resistant DesignSpecifications:- type: handgun sight - material: fiber optics - color: Red front/green rear - firearm type: Glock 20, 21, 29, 30, 31, 32, 37".