These are 10mm diameter M4x0.7 threaded balls for Kossel delta 3d printer magnetic joint system. Each printer will require 12 pcs to complete assembly. You will need M4x20 setscrews to make connection between balls and carbon tubes.Specifications:
- Diameter: 10mm
- Thread size: M4x0.7
- Material: Chrome plated steel
- 12 x 10mm Diameter Balls with M4 threaded holes.