Fits STI 2011 pistols and clones with front sight dovetails machined to STI specs - .300"wide x .060" deep x 60 degrees. All 2011s require a front sight with correctly dimensioned and engineered dovetails to fit properly. The best front sight on the market is made by Dawson Precision and I am pleased to offer it to compliment my rear sight product line. The DP serrated black sights are machined from hardened steel and crisp black appearance. They are offered in ramped profile .180" tall x .125" wide. This is the base sight to order if you want a gold bead installed.