Burris 420162 XTR Rings (30-mm, Medium, Black) Black Aluminum Xtreme Tactical Rings Size: Medium, 30 mm; Height: 1.10 in; Rings per Set: 2 Fits on any Weaver or Picatinny-style mount Ideal for tactical use/Also great for hunting rifles, slug guns, and muzzleloaders Optional Picatinny rail on top of ring allows for attachment of accessories on top of a mounted scope