Features:Fits the .45 Glock 21, 30, 41 (does not fit SF).Extended 18-round capacityDue to the wide variety of extensions for Glock, our mag base is designed to be compatible with Glock extensionsEasy disassembly with our specially designed base plateErgonomically designed floor plate makes it easy to grab from mag pouchesLifetime WarrantyAdvanced Polymer Benefits: Extreme Impact Resistance-won't crack or break when droppedVery resistant to harsh chemicalsSuperior heat, cold and UV resistance-won't become brittle over time even when exposed to harsh environments or extreme coldTranslucent body-allowing you to see your ammo count and typeCreep resistant-the feed lips and body won't spread when being stored long term even when fully loaded