RAM-B-189BU Double Suction Cup Base The RAM-B-189BU consists of a double 3.3" twist lock suction cup base. Included is a hole pattern that will allow attachment to all RAM bases that contain the universal AMPs hole pattern. Material: High Strength Composite and Powder Coated Marine Grade Aluminum Note: The "U" in the part number reflects product packaged in poly bag. Related Links: Double Suction Cup Base Assembly Instructions Weight: 0.7 lbs. Share Buy $45.00 Shipping Details Shipping cost for item: $9.00