020-019 STI 1911/2011 Full Size Fiber Optic Inserted Front Sight .180 Tall x .090 Wide, Match with All Rear Sight, Front, STI, SV and Heinie, 1911 and 2011, Optic, 0.090 Wide, 0.180 High, Patridge and Serrated, Factory Dovetail, Use w/ Factory or DP Adjustable Rear