The Marble Arms .375" Fiber Optic Glow 37-W Front Sight provides enhanced target acquisition with green fiber optic technology for improved visibility in various lighting conditions.Marble Arms 37-W Front Sight.375" diameter specification for precise fitFiber optic glow technology with green insertDurable steel constructionEnhanced visibility for faster target acquisitionIdeal for rifle shooters seeking improved accuracy and faster sight picture acquisition in hunting and target shooting applications.