Use this Optics rings for mounting 30 mm telescopic sights onto flattop style rifles. The 2 or 3-inch offset of this Optics rings positions the scope in a forward location, allowing the correct eye relief and head placement on an rifles. Lightweight, aluminium clamps and housing reduce total weight without sacrificing reliability. The Optics rings mount positions the center of the riflescope tube at a height of 1.26 inches (32mm) from the base.Cantilever Rings combine rock-solid reliability and strength with high quality machining to ensure ultimate accuracy and consistency. Streamlined, lightweight and durable, these rings use four socket cap screws for secure mounting.