INCLUDES: 20mm Metal ball Non-Sticky Suction Cup Base. FEATURES: a Heavy Duty 90mm non-sticky suction cup base with metal tightening lever that is great for heavy duty conditions such as truck or commercial vehicle windshields. Commonly used with IBBZ-33768 or IBBZ-33943 and other industry standard 20mm dual ball mounts / arms including those from ElGato, Tackform, Arkon, etc. COMPATIBILITY: Compatible with all 20mm mounts and adapters including the iBOLT FixedPro Series and other industry standard 20mm ball mounts and adapters. This iBOLT 20mm Metal ball suction cup base is made out of sturdy Aluminum, composite, and rubber material (for the suction cup base) compatible with all industry standard 20mm mounting arms, such as the iBOLT FixedPro Series.