This rail adapter is compatible with any Arca-Swiss standard and RRS dovetail standard ballhead. CNC machined from aircraft-grade 6061 aluminum. Type II, class III hard anodized. Mounts directly to M-LOK compatible systems. Precision machined aluminum construction for strength without excess weight. Functional snag-resistant beveled edges. Corrosion-resistant hard anodized finish. Close-end rail which limits over-travel of your rifle while also serving as installation reference points(close-end forward). Made in the USA.