RAM 2.5 Round Base with Amps Hole Pattern & 1 Ball RAM B 202U RAM Tripod Base with Ball (RAM 205U) (sku 53865) RAM 1.5" Ball Mount with Track Ball Base & 2" x 4" Plate for the RAM 202U 225 RAM Ball Base with 1.5" x 2" 4 Hole Pattern C Size Ball Bases E Size 3.38" Ball RAM Mounts UK RAM Double Ball Mount with Drill Down, U Bolt & Adhesive Bases RAM. The tripod attaches to the RAM 202 around the 2. 5" diameter base. The legs are connected by screws that fit through the holes on the RAM 202. The wing nuts on the end of the screw can be tightened by hand. Hardware included Assembly Hardware