Integration offers strength and consistency. Browning's Integrated Scope Mount System unitizes the ring and base into a single, ultra-rigid unit. Machined from 7000 series aluminum alloy, they eliminate alignment problems and the possibility of a loose connection between the base and ring. They are available in .400" standard height, .500 intermediate height. Integrated scope mounts unitize the ring and base into a single, ultra-rigid unit machined 7000 series aluminum that eliminates alignment problems and the possibility of a loose connection between bases and rings. Features:Machined from 7000 series aluminum for high strength and durabilityThe integrated design eliminates alignment problems and the possibility of a loose connection between bases and rings.400 standard height, .500 intermediate height