Dlibuy M3 Hotend Aluminum Alloy Fisheye End Effector (Screw Hole 3mm) for Kossel Delta 3D Printer 1, Compatible: Delta Kossel 2, Threaded hole type: M3 3, CNC Processing: Surface sandblasting oxidation 4. Easy to install 5, NOTE: Product interpretation owned by Dlibuy, do not buy inferior products from other offers