RAM mount with 2 RAM b238 bases and standard b201 double socket arm. B238 bases are diamond shape bases with 1 inch diameter B size ball. B201 standard length double socket arm is 3 inches from socket-center to center and 5 inches overall length. 1 inch diameter B size ball. RAM universal ball and socket mount system. Marine grade aluminum with powder coat finish, stainless steel hardware and rubber balls. Lifetime Warranty.