AmeriGlo AmeriGlo GL-411 Sup Trit Sights For Glk W/b suppressor height sets provide an elevated sight picture, able to co-witness with slide-mounted miniature red dot optics and suppressors. This flat black rear with tritium front sight set is designed for use on Glock MOS pistols using the Aimpoint ACRO and Holosun 509T optics. For more information on how to choose the correct height set for your suppressor or optic, visit the AmeriGlo website, under the INFO tab.Features :"Green tritium" .140" wide with white outline front""Flat black" .150" square notch rear"".315" Front Blade Height"".394" Rear Height"Fits all Glocks except 42/43