These are for those who demand top stability. Totally integrated ring and mount system. 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 and .600" High height versions to fit your needs. Features: - Machined from 7000 series aluminum for high strength and durability - The integrated design eliminates alignment problems and the possibility of a loose connection between bases and rings Specifications: - Color: Black - Pockets: Matte - Mount Pieces: Two Piece - Ring Diameter: 30mm - Ring Height: Standard - Screw Quantity: 4 - Bases Screws : .1875:.3125 - Ring Screws: 0.375 - Weight: 4.80 oz.