The RAM-162H-MC4 Horizontal Swing Arm System is a horizontal ratchet extension system with 1.5 inch diameter rubber "C" sized ball.
RAM-162H-MC4 shown above.
RAM-162H-MC4 Included Features:
NOTE: Manufacturer's specifications can change without notice.
Warranty: Manufacturer's, RAM Mounts (National Products Inc.), Limited Life Time Warranty.
Size: Compatible with RAM C sized parts / Max. Weight 10 lbs.
Material: Black powder coated marine grade aluminum.
RAM-162BU Ratchet Base with Ball Description: The RAM-162BU is a ratchet base with RAM C sized 1.5 diameter rubber ball. The ball can attach to other RAM C sized accessories with an open end socket. The ratchet side of the base attaches to the RAM-162AU. 
RAM-162AU Long Ratchet Swing Arm Description: The RAM-162AU is a 12 inch long ratchet swing arm.
RAM-162SU Swivel Base Description: The RAM-162SU is a swivel base with ratchet arm. The ratchet arm side of the base connects to the RAM-162AU ratchet arm and the other side of the base connects to the RAM-109H-BU base.
Horizontal Base Description: The RAM-109H-BU is a horizontal mounting base that attaches to the RAM-162SU swivel base.
