Manufaturer Part Number: SOA20001Sig's alpha2 scope mounts are machined with an exactness that is both strong yet ductile that allows the rings to form around a riflescope, yet will not damage scope under proper installation.The steel rings are epoxy powder coated to prevent oxidation and resist gun oils, cleaning solutions, and outdoor exposure.It features steel weaver-style clamps.This model has 30mm rings and black finish.Type: 1-Pc Base & Ring ComboModel: Alpha2Style: 1-PieceMisc: 30mm RingFinish: BlackMaterial: 6061-T6 AluminumPieces: 1Rings Included: Yes