Designed specifically to stand up to the rigor and immense recoil that accompanies tactical shooting, these heavy-duty Xtreme Tactical Rings keep your optics secure for the most demanding missions. These super-strong rings are made of lightweight aluminum. Six screws anchor these rings and your riflescope in place on any Picatinny or Weaver-style rail for an unfailing return-to-zero. Choose from four ring heights to suit your optical objective, whether it's a red dot sight or riflescope scope. These rings are perfect for riflescopes on AR-15/ M16 flattop receivers and give you ample room for a proper cheek weld. These sturdy rings will also look good on varmint rifles, and they&rsqu Mfg: Burris SPECS: Heights as measured from top of rail to bottom of ring: Low ¼", Medium ½", High ¾", X-High 1"; X-High 1" version is ideal for AR15/M16 flattop receivers where scope height is critical. Includes 2 rings.