1-inch scope rings of medium height for Weaver rail and scope base. Made of solid aluminum alloy with a square-shank steel cross bolt to better withstand shock and recoil. Wrap-around design for exceptional clamping and centering. Fits Weaver and Picatinny mounts, rails, and bases as commonly found on rifles, pistols, and some crossbows. Works with scopes and red dot sights of 1 main tube. Medium (21.80mm) center height. Good for mounting scopes with objective OD up to 40mm. Quick and easy to install. Clamps onto a Weaver base/rail and tightens using a thumb screw with a coin slot. Anodized matte black finish. Saddle Height: 9.10mm Mounting Width: 20.30mm (front to back) Hex wrench included Before buying these rings, we suggest you take a measurement of the outside diameter of your scope objective end and be sure the OD(outside diameter) is no more than 40mm.