"The XS Sight Systems HK P2000 SK 9/40 Pistols 24/7 Big Dot Tritium Express Set is a original fast acquisition sight enhanced with the 24/7 Tritium rear sight. XS 24/7 Express sights are the finest sights made for fast sight acquisition in all light conditions. Day Light, Half-Light or Low-Light, just ""dot the I"". Fast, simple andamp; effective. This is the ultimate self defense, self aligning sight system that provides sights you can see around the clock.|Fits all HKP2000 SK (subcompact) 9/40 pistols|Enhances sight acquisition in all light conditions just dot the ""I""|Ultimate ""Flash Sight"" picture for instinctive shooting|Excels in high stress defensive situations|Improves Low-Light accuracy|Low profile, snag free design|Features the ultra visible ""Big Dot"" Tritium front sight|Factory Trijicon Tritium vials guaranteed and the best tubes available in the industry"