LiteWave H3A(R) sight combines Tritium with the HIVIZ Litepipe technology for 24 illumination. Now you can have the advantage of day and night performance all in one sight system. All steel construction sight sets are rugged and durable designed for the roughest use whether it is personal defense and protection Law Enforcement or Military.The new LiteWave H3A(R) ensures fast sight acquisition and a bright sight picture day or night.Features: XDN321 XDN421 XDN521 XDN621 Fits: XDXDSXDE and XD-M models; does not fit the XD 5.25. Sight visibility in all light conditions Ultra bright encapsulated Tritium Factory sight heights All steel construction Fits standard holsters Patented technology