Precision CNC machined from a block of 6061 T6 aluminum and finished in mil-spec anodized black for a rock hard finish. Compatible with most 1.5x16, 1.5x24, 2x20, 3x24 and 3x30 ACOG models. Fits most Weaver rails. Weighs 2.7 ounces. Made in the USA. 1.37 in. height of mount surface to optical axis.