This 30mm HIGH Extra Height See-Thru Scope Rings by Hammers are designed for a PCP rifle with a rotary magazine. Made of lightweight aluminum in a sleek black color, these rings offer a high height for needed clearance off the rotary magazine. The see-through design allows for a clear view while shooting, making them perfect for hunting and sporting activities. These scope rings are durable and reliable, providing a stable and secure mount for 30mm rifle scopes: 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. Works with scopes and red dot sights with a 30mm main tube. HIGH (39.60mm) center height with see-thru opening. Extra Height design to clear installed rotary magazine when used with PCP air rifles. Quick and easy to install. Clamps onto base/rail and tightens using a thumb screw with a coin slot. Anodized matte black finish Saddle Height: 24.60mm Mounting Width: 20mm (front to back) Hex wrench included