Weaver's new Weaver Grand Slam Leaver-Lok Top Mount Rings offers top-quality Grand Slam steel making it easy for you to attach and detach the rings while still maintaining the strongest support out there. This product is made specifically for the avid gunsmith and with no tools only your thumb you can use the thumbscrews to attach and details these mount rings with ease. These rings can be custom made to fit whatever gun you call your absolute favorite.