These dampers will fit NEMA 17 sized stepper motors , commonly used on 3d Printers andother CNC type machinery.Benefits of using cork dampers / isolators for your project:1.Reduces vibration transfer to printer frame2.Greatly reduced thermal transfer from hot running motors to plastic frame parts3.Reduced resonance from motor , less rattles and noises from printer4.Lasercut for perfect hole alignment and fit to NEMA 17 type hole spacing.5PCS *Nema 17 Stepper Damper (Does not contain motor)