Fits: Glock 17,19,22-24,26,27,31-36,38 Night Sights designed for defensive shooting and comfortable concealed carry. XS Tritium Big and Standard Dot Sights are designed for: Snag free design for easy draw from holster without catching clothing Large front sight to improve speed of front sight acquisition V-Notch rear sight provides a large field of view for greater target identification Tritium lamps aid sight alignment in low/dark light environments Our night sights will allow you to get on target fast, focus on the front sight, and make a lethal/reliable shot.