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16Pcs 10 M4 Threaded Steel Ball Rod Ends For Kossel 3D Printer Magnetic Joints Specification: 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 & 12 magnet for the joints. Outer Diameter: 10 (mm) Thread: M4 Material: Stainless Steel Package includes: 16 x M4 Threaded Stainless Steel Ball