3/8 or 11mm dovetail 70/30 split Fixed design 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.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }