Engineered and manufactured by our expert staff in Tualatin, Oregon. Utilizing proprietary sintered steel technology, Maxima Horizontal offers unwavering strength and precision in a stylish, yet traditional form. 4 screw ring caps, along with a unique recoil key and clamp offer easy installation and unrivaled holding strength. With classic lines, and Warne?s return to zero guarantee, Maxima Horizontal are the new standard.Specifications and Features:Country of Origin: United States of AmericaExtended: NoFinish: MatteHeight: MediumMaterial: SteelPiece: 2Style: PicatinnyTube Diameter: 30mm