The RAM-B-224-1U suction cup base consists of a 3.3" diameter RAM® Twist-Lock™ suction cup connected to a RAM-B-238U diamond base with a 1" B size rubber ball. The RAM® Twist-Lock™ suction cup base is a fan favorite for use on vehicle windshields, and provides an extra strong hold on any smooth, nonporous surface. Complete your mount by attaching a B size RAM® double socket arm and device holder (sold separately). Made from high-strength composite and powder-coated marine-grade aluminum. 3-1/4" twist-locking suction cup base for an extra-strong hold. 1" rubber ball mount. Connects to a large variety of RAM mounts and cradles (sold separately). Weight capacity: 2 pounds (standard use) / 1 pound (heavy-duty use). Backed by a lifetime warranty. Note: For best results, use suction cup on glass or other non-porous plastic surfaces.