The Yankee Hill Machine 5040 Q.D.S. Sight Set provides reliable backup iron sights for AR-15 and AR platform rifles with quick detach capability and durable aluminum construction.Yankee Hill Machine 5040 Q.D.S. Standard Sight SetFlip-up folding front and rear sight designQuick Detach System (Q.D.S.) for easy installation and removalAluminum construction with black hardcoat anodized finishCompatible with AR-15 and AR platform firearmsFolding back-up sight set for space-saving profileIdeal for shooters who need reliable backup sights that can be quickly deployed when needed while maintaining a low profile when folded down for primary optic use.