This is the same great Dawson fiber optic front sight for STI pistols. Serrated front is .180 tall; the correct height for STI 1911 and 2011 guns with factory adjustable rear sights. (Note: STI guns with factory fixed rear sight need a .160 height front). Available in .090, .100, or .125 widths. Comes with extra .040 green and red fiber rods and installation tool.