The Marble Arms 45-MR Fiber Optic Front Sight features a .450" steel construction with a bright orange fiber optic glow element for enhanced target acquisition and accuracy.Marble Arms 45-MR Fiber Optic Front Sight.450" diameter steel construction for durabilityOrange fiber optic glow element for visibilityPrecision-engineered for rifle applicationsEnhanced sight picture in various lighting conditionsIdeal for hunters and marksmen seeking improved accuracy with reliable bright sight alignment that performs in low-light conditions.