Small skull hold 10 cm diameter head with hook. Same as medium hook ball grip.
A device that includes 3 central elements: 1. 1. Holding handles on the sides 2. A pair of spinner balls 3. A rotating finger 4. A "window" grip
A medium ball that rotates on bearings. Comes with Allen screw, nut and washers ready to install on a plate.
Each side has a medium ball that rotates 360 separately.
