You count on your handgun to be reliable in any situation. Your sights should be held to the same standard-which is why Truglo Tritium-X sights for the Glock 42 and 43 are made from solid steel and treated with a nitride Fortress Finish to handle just about anything. Swiss tritium lamps provide a bright and constant glow in low light or even complete darkness. Tritium does not require any batteries or light exposure-it simply glows! Features3-dot configurationTransitions from white dots to glowing tritium dots for day and night visibilitySmooth, snag-free design fits most standard holsters DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.