This gray metal MK8 extruder is an original upgrade replacement part for Creality Ender 3, Ender 3 Pro,Ender 5,CR-10, CR-10S, CR-10 S4, CR-10 S5, CR-10 Mini, CR-10S, CR-10 Plus and other bowden 3D printer. No need to change stepper motors or other mounting hardware.