The first factor to consider is the material type being drilled. Different materials require different speeds in order to achieve the desired results. For instance, drilling into softer materials such as aluminum will require a slower speed, while harder materials such as stainless steel will require faster speeds. Additionally, the size of the material will also play a role in the speed selection. Thicker materials such as sheet metal will require slower speeds, while thinner materials such as plastic will require faster speeds. https://drillingguy.com/best-drill-bits-for-porcelain-tile/