The better you can see your sights, the better you can shoot. We brought fiber-optics to the shooting sports industry decades ago for this very reason. TFO pairs our fiber-optic sights with our tritium night sights to create a consistently bright sight picture day or night! Our patented combination of tritium and fiber-optic technologies unites the best of both worlds providing the same bright sight picture whether you are in glaring daylight or complete darkness. Fits 1911 Models - 0.260 Front/ 0.450 Rear (1911 5" Government .45ACP, Ruger SR1911 models with fixed rear sight).Front Sight Height:0.260" Rear Sight Height: 0.450".