RAM® Double Socket Arm without Knob - Acorn Nut - B Size Medium RAM-102L-D-2461 The RAM-102U-B-2461 consists of a

The RAM-102U-B-2461 consists of a SHORT double socket arm and 3

5" diameter C size rubber ball and socket system that features adjustment points at both ends of the double socket arm

75" diameter twist lock suction cup

The RAM-B-174U consists of a 1" diameter rubber ball

RAM® Double Socket Arm without Knob - Acorn Nut - B Size Medium RAM-102L-D-2461 The RAM-102U-B-2461 consists of aThe RAM B 201NKU is our medium length B size double socket arm with an acorn nut instead of a hand tightening knob. This would be a good choice for someone who does not have room for a traditional hand tightenning knob or if you want a tool to be required to adjust the arm.