The Riton Optics 30mm Medium Scope Rings feature precision-machined, and hard-coat anodized 6061-T6 aluminum construction for optimal strength and maximum weight savings. The built-in clamp mount features steel thumbscrews for quick installation on any 1913 Picatinny rail and does not require any lapping or custom fitting for dependable service right out of the box. Includes all installation hardware. Lifetime warranty. Compatible with most 30mm rifle scopes.