1" Xtreme Tactical Rings Ideal for all scopes on AR15/M16 flattop receivers for proper cheek weld, these ultra-strong 1" rings are available in four heights to accommodate any type of scope. The wide 6-screw rings combined with lightweight, yet thick, cross section aluminum provides a reliable return-to-zero, high-strength mounting system for Picatinni-style rails. Size: 1/4" (low)