The Micro Rosette to TWIST Mount is one part of a modular accessory arm with a quick-release spud clamping, allowing attachment of a wireless transmitter, monitor, audio receiver, and more to a camera. Clamps have a variable friction design, so you can grab and twist the arm or accessory without loosening a thumbscrew. Micro Rosette to TWIST Mount (Hole) is the version with a 1/4-20 threaded hole. Micro Rosette to TWIST Mount (Screw) is the version with a captive 1/4-20 screw. If you need a more complete arm set, consider: Micro Rosette TWIST Mount Kit (1/4-20 to 3/8-16) Micro Rosette TWIST Mount Kit (1/4-20 to 1/4-20) A Complete Kit is also available and includes additional pieces: Micro Rosette Complete Kit To add Spuds, visit this page: TWIST Mount Spud Check out our Spud Compatibility Chart Here.