For Remington 700: Also fits the Remington model 721 and 722 & Bergara B14. Right-hand mount fits right hand firearms and left-hand mounts fit left hand firearms. MOA Mounts are tapered down on front for long range shooting. Height will be about .03? lower on front ring than a standard mount. Base screws are 6-48 X 1/4" long. Ring screws are 6-40 X 5/8? long. Both use a 7/64? Allen wrench. Some of the .338 Lapua receivers have been modified at the factory and have larger base screws. The size of them is 8-40 and will use a 9/64 Allen wrench. Check your gun and see because the mount will have to be modified. Choose Model 700 (8-40 screws) if your gun uses the larger 8-40 screws. Short action ? 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?.