Solid Mounting With A Clean Look
These rings fit the popular “twist-and-lock” bases by Burris, Leupold, and Millett. The ring has a dovetail that fits in the slot in the base, then must be turned 90° to lock it in. One of the strongest scope mounting systems ever devised, these rings will not shoot off their bases, even on the hardest-kicking, large caliber magnum rifles.
Big Book Catalog, Issue:68, Page:271
New Product Supplement, Issue:542, Page:000
Sinclair, Issue:5A, Page:205
Measurements are from the bottom of the scope tube to the bottom of the ring: Med .270", High .390"