This 3-Dot tritium system has a superior glowing illumination in low-light and remains bright and white for daylight conditions. No more changing sights from night to day patrols, keeping your sights consistent for all your work or hunting light conditions. The steel surrounds the tritium sights and gives them protection from recoil and protects from cleaning solvents and the harsh elements. Whether you carry for work or for sport, these X-RAY3 tritium sights will be bright for over a decade and the tested design of the X-RAY3 will stay at max performance. Front Sight Height: 0.375" Rear Sight Height: 0.417". Equivalent of #6 Front and #8 Rear. Day/Night Sight Set for P-Series: P320/P938/P238/P229/P226/P220/P227/P225.