The RAM® Flex-Rod™ 24" Rod with B Size amp; C Size Socket Arms is designed to mount with flexibility. Includes C size short socket and works with compatible B size phone and tablet holders. KEY FEATURES Made from high strength composite Weight: 0.85 lbs Bottom Arm Socket: C size Top Arm Socket: B size This kit is designed to mount nearly any phone to the seat track on most major wheelchair brands. The included C size single socket arm can be attached to the RAM® C size wheelchair track base (sold separately) and connects to the included Flex-Rod™ extension and the RAM® B size single socket arm. To complete your setup, pair with a compatible B size tablet holder.