The Marble Arms .450" Fiber Optic Glow 45-W Front Sight delivers enhanced target acquisition with bright green fiber optic technology in a durable steel construction.Marble Arms .450" Fiber Optic Glow 45-W Front SightGreen fiber optic insert for improved visibilitySteel construction for durability and reliability.450" diameter specification for proper fitModel 45-W design optimized for rifle applicationsIdeal for hunters and competitive shooters seeking improved sight picture and faster target acquisition in various lighting conditions.