Note that there is a big difference in quality of gears, We have tested many and found that the ones we offer now are of the highest quality. We buy them from a Swedish company. They are more expensive than others but much better and quieter. We also drill them to fit nema motors with 6.35mm hole.

The gears are drilled to fit standard nema23 motors 6.35mm

Teeth: 15
Hole: 6.35mm