Base screws are 8-40 X 1/4? long. Ring screws are 6-40 X 5/8? long. Base screws use a 9/64? Allen wrench and ring screws use a 7/64? Allen wrench.
Outside to outside of rings is 3.92?. Rings are .63? wide. 4 Hole to hole spacing dimensions are .86?, 79?, .86?. Height of mounts from top of barrel to centerline of scope tube is – low 1.00?, medium 1.13?, and high 1.25?.