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. Assembled in USA with Swiss tritium. Snag resistant design, fits standard holsters. This model fits 1911 MODELS .260 Front / .450 Rear Novak LoMount* cut (1911 5" Government .45 ACP) Ruger SR1911 models with fixed rear sight *Reference to Novak LoMount is for compatibility use only. This product is not endorsed by, or affiliated with Novak Designs, Inc. Fiber Diameter: 0.060". Front Sight Length: 1.0". Front Sight Width: 1.0". Front Sight Height: 1.0" Rear Sight Length: 1.0". Rear Sight Width: 1.0" Rear Sight Height: 1.0".