One look and you know Burris Xtreme Tactical Rings are all about point-of-aim security and durability. The super strong yet surprisingly lightweight, six-screw aluminum rings anchor scopes in place on any Picatinny rail or Weaver-style base to deliver unfailing return-to-zero. A choice of four ring heights accommodates the installation of any sight from red-dots to large objective target scopes. The 1" height is perfect for all scopes on AR15/M16 flattop receivers, providing proper cheek weld. Designed and built for the rigors of tactical shooting and massive recoil, Burris Xtreme Tactical Rings are not out of place on varmint rifles or big game rifles that may be expose to the abuses of hard hunting and magnum recoils. Sold as single ring or pairs to meet your specific needs. Torque:Ring Tops: 20 in/lbsRing Cross Bolt: 65 to 100 in/lbs Note:6 screw ring; 3 per side