RAM Round Plate with Ball - B Size, also RAM-B-202U, features a 1in B size rubber ball on a 2.5in diameter round plate. This component's holes are pre-drilled per the universal AMPS hole pattern. This 2.5in round plate connects to RAM® holders using this same pattern. The included B size 1in RAM® rubber ball connects to any B size RAM® double socket arm, providing near-infinite adjustability. The plate is made of powder-coated, marine-grade aluminum, ensuring durability and reliability even in demanding environments. Lifetime warranty included. The 4-Hole AMPS hole pattern is 1.181in x 1.496in. The 3-hole 120-degree pattern is 1.812in. Plate is 2.5in in diameter. Standard usage weight capacity is 2 lbs. Heavy-duty usage weight capacity is 1 lb.