The HD Night Sights were specifically created to address the needs of tactical shooters. The three dot green tritium night sight sets front sight features a taller blade and an aiming point ringed in photoluminescent paint while the rear sight is outlined in black and features a wider U-shaped notch. This unique configuration increases visibility and quickens front sight acquisitioneven in transitional lighting. Additionally, the front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation. Green tritium lamps are warranted for 12 years from date of manufacture. Front Sight Width: 0.144". Front Sight Height: 0.279". Rear Sight Height: 0.309". Fits Sig Sauer models calibrated for 9mm and .357SIG, and pistols that come factory standard with #8 Front/#8 Rear including P225, P226, P228, P239, and P320 (Excluding P938 and P365).