Featuring a one inch tube diameter, the body of the scope is machined from a single solid block of aircraft-grade aluminum. Hard-anodizing ensures superior durability and scratch resistance. O-ring seals prevent moisture, dust, and debris from penetrating the riflescope for reliable performance in all environments. Argon gas purging prevents internal fogging over a wide range of temperatures. Rifle hunters and shooters looking for a lightweight, optically superior, riflescope that tracks true, will find their match with the Razor HD LH.