Trijicon Bright & Tough Suppressor Night Sights are three-dot tritium iron sights that allow shooters the ability to line up their sights in both bright and low-light situations. While standard height sights do not provide an aiming solution when using a suppressed firearm; the additional height of suppressor night sights will clear the added height of a suppressor, allowing shooters the ability to line up their sights on target. Additionally, suppressor night sights can be used as back up iron sights with the Trijicon RMR. Fits Sig Sauer models calibrated for 9mm and .357SIG, including P225, P226, P228, P239, and P320 (excluding P938).