The Marble Arms 34-MR Fiber Optic Front Sight features a .343 inch steel construction with a bright orange fiber optic glow element for enhanced target acquisition and accuracy.Marble Arms 34-MR Series Fiber Optic Front Sight.343 inch diameter specification for precise fitDurable steel construction for long-lasting performanceOrange fiber optic element for high visibility in various lighting conditionsDesigned specifically for rifle applicationsIdeal for hunters and sport shooters seeking improved sight picture and faster target acquisition with reliable fiber optic technology that gathers ambient light for enhanced visibility.