16Pcs &amp;Phi;10 M4 Threaded Steel Ball Rod Ends For Kossel 3D Printer Magnetic Joints<br>Specification:<br>Threaded steel ball rod end is for mini kossel delta 3D printer magnetic ball joint system.Each printer will need 12 pieces.You'll need M4 x 20mm grub set screws to make connection with the carbon tube &amp;amp; 12 magnet for the joints.Outer Diameter: &amp;Phi;10 (mm)Thread: M4Material: Stainless Steel<br>Package includes:<br>16 x M4 Threaded Stainless Steel Ball