TWIST Ball Monitor Arm 9 Inch (No Spuds)TWIST Ball Monitor Arm 9 Inch (No Spuds) is an articulating arm that accepts TWIST mounting spuds and utilizes a variable friction 15mm clamp. With the variable friction design, you can grab and twist the attached spud without loosening a thumbscrew. No spuds are included in this arm. For a build your own TWIST Ball Arm, please check out this page. The Speedball Clamp's "Chip Clip" design allows for easy, annoyance free installation, and the