3/8 or 11mm Dovetail 70/30 Split Fixed Over Built for the task! The Warne Rimfire rings were created to fits both the 3/8th inch and 11mm dovetails found on many common rimfire rifles. Featuring a unique 70/30 horizontal split design, these steel rimfire rings are the best available. Rimfire rings from Warne Scope Mounts give you more than enough strength for the job. We've earned a reputation for making quality scope rings in the U.S. using premium materials, and these 732M 30mm high matte rings are a good example of that quality. Featuring a unique 70-30 horizontal split design for superior grip and steel construction for strength, these rimfire scope rings fit both the 3/8 and 11mm dovetails that are usually found on rimfire rifles.