This is a 4 to 1 gear reduction with strong metal gears for nema 23 steppers. We use this for our rack and pinion model Plasma CNC. This will give you 4 times more power so you will have enough power to do milling and more accelerations to come out of corners quicker to get a more even cut when plasma cutting. They can be adapted to fit others brands. Stepper not included.
 Output shaft ID 8mm or 5/16"
 Small gear for stepper ID 6.35mm or 1/4"