Base screws are 6-48 X 1/4″ long. Ring screws are 6-40 X 5/8″ long. Both screws use 7/64 Allen wrench. Height of mounts from top of receiver to centerline of scope tube is high 1.19″. Mount fits right hand firearms. Long action – Outside to outside of rings is 4.820″ Standard rings have 2 screws per ring and rings are .63″ wide. Tactical rings have 4 screws per ring and are .80″ wide. 4 Hole to hole spacing dimensions are .70″, 3.931″, .70″.