( Mount Features ) - Material: Aluminum, Color: Anodized Matte Black, Length: 5.4", Weight: 2.5 oz. - Compatible with many HK Spec rifles/pistols including MP5, SP89, HK91 HK93 HK94, CETME, PTR-91, 1st Generation GSG5 and similar clones, Provides a 5.4" Picatinny type interface for attaching your optics, Note that this item will not fit some of the Bobcat Hk clones due to Non Hk Spec dimensions --- ( Scope Ring Features ) Durable aluminum construction, Internal Diameter: 1 inch, Will attach to Picatinny type mounts. Heavy duty design, These scope ring mounts allows mounting most scopes with objectives up to 48mm. Brand New items with Manufacture Warranty Against Defects