TRUGLO TFX Tritium and Fiber-Optic Xtreme Handgun Sights for Kahr Arms K, MK, P, PM, T&TP Models with New Dovetail (produced after 2004) Unmatched Visibility in all shooting conditions, night or day; Glows in the Darkno batteries or light exposure required Front sight Focus-Lock Ring for even faster focus TFX Sealed Capsule Design provides maximum protection and durability; Fortress Finish provides a permanent protective coating; Impervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processes Concealed Fiber cannot be seen by target; Snag Resistant Design fits standard holsters MACHINED AND ASSEMBLED IN THE USA with quality Swiss Tritium for maximum brightness; 12-YEAR LIMITED WARRANTY; Patented