Monstrum Tactical Heavy Duty Rifle Scope Ring Set, Medium Height, with Picatinny/Weaver Rail Mount, for 30mm or 1" Scopes 30mm diameter scope rings for mounting standard 30mm tube rifle scopes Optional 1" scope ring inserts can be used inside the scope rings, allowing for perfect fit mounting of 1" scope tubes Mounts to any flat top Picatinny or Weaver rail equipped rifle Medium profile in height, 14mm from base of mount to bottom of rings Light weight aerospace aluminum construction