Tritium/Fiber Optic (TFO) technology combines the self-illuminating properties of Tritium with the light-gathering capabilities of fiber optics to ensure fast sight acquisition in any light conditions from daylight to complete darkness. Precision-machined, steel body provides excellent strength to handle the rigors of combat or competition. Low-profile design prevents holster snagging. Fits Novak Lo-Mount rear dovetail and Novak style front dovetail; rear sight includes setscrew for extra-secure installation on slide. Sold in front/rear pairs. Mfg: Truglo SPECS: Steel, matte black finish. Fiber optic/Tritium rods, green front/green rear or green front/yellow rear. Sight heights regulate with Govt. or Off/Comm models chambered in 45ACP. Fit 65degree x .495" nominal rear dovetail and 65 degree x .330 front.