Universal Speedball Extension only comes in a 3 inch, 6 inch, 9 inch version, or a bundle that includes all three lengths.  The three versions of extension arms can be nestled together in a bundle, saving space in your kit.

Each arm has pass-through slots and holes for 1/4-20 and 3/8-16 screws. Larger holes can be utilized for nested extension packing and organization.

Universal Speedball components are compatible with any other brand of 1 inch (25mm) ball attachment like Ultralight Control Systems, Wooden Camera, etc.