Ncstar RMB18 Scope Rings 30mm With 1" Inserts Tri-Rail Weaver / Picatinny Style Color Black Medium Profile Scope Ring. Precision Machined Scope Rings from aircraft-grade aluminum for strength and recoil resistance. Rings Will Mount Onto 30Mm & 1" Scope Tubes. These Detachable Rings make it easy to change out any scope. You Can Mount a Tactical laser sight or Flashlight right on your scope ring. Lifetime Warranty.