The sightmark tactical 30mm fixed cantilever mount is a fixed mounted riflescope base compatible with 30mm scope tubes.This mount features a two-inch forward offset allowing the use of riflescopes requiring a greater eye relief and more comfortable cheek placement on ar-style rifles.The 30mm fixed mount is constructed of aircraft-grade 6061-t6 aluminum and finished in a matte black non-reflective coating.Cantilever mounts make transferring your optic easy.This mount is perfect for installing and removing an optic from your firearm without losing zero.Includes 1.0" reduction rings.Length: 5.98"Type: 1-Pc Base & Ring ComboModel: Tactical 30mm Fixed CantileverStyle: Fixed/Cantilever/OffsetMisc: 30mm RingFinish: Matte BlackMaterial: 6061-T6 AluminumPieces: 1Mount Type: Picatinny RailRings Included: YesMount Height: 1.50"