Outside to outside of rings is 4.26″ for standard ring mounts. Standard rings are .63″ wide and have 2 ring screws per ring. Tactical rings are .80″ wide and have 4 ring screws per ring. 4 Hole to hole spacing dimensions are .86″, 3.63″, .60″. Height of mounts from top of receiver to centerline of scope tube is – low .98″, medium 1.11″, and high 1.23″.