Here's some information about step drill bits:
Multi-size drilling:
Each bit has a conical shape with multiple steps, allowing you to drill various hole diameters without needing to change bits.
Ideal for thin materials:
They are commonly used for drilling in materials up to 1/4 inch thick, such as sheet metal, wood, and acrylic.
Reduced chatter:
The gradual increase in diameter helps to reduce chatter during drilling, leading to smoother and more consistent holes.