For Dovetailed Receivers
Ring-over-mount design allows instant choice between iron sights or scope. Feature Weaver split ring design; fits nominal 3/8" (9.5mm) dovetail grooves on airgun and rimfire receivers.
Big Book Catalog, Issue:65, Page:257
SPECS: Base - aluminum , anodized, black. Cap - steel blued. 1" (2.5cm) inside dia. Coin slot, side mount screws, Sold in pairs.