AmeriGlo GL-329 Optic Height Trit For Glk suppressor height sets provide an elevated sight picture, able to co-witness with slide-mounted miniature red dot optics and suppressors. This tritium 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""Green tritium 2-dot" .150" square notch with white outline rear"".315" Front Blade Height"".394" Rear Height"Fits all Glock models except G42/43