1. High-speed steel material, more durable.
2. No need for a pilot hole can automatically deburr holes as you drill.
3. Special step structure can drill different size holes,
4. 1step drill can be used as 1 box of a drill bit.
5. Working with water cooling can effectively extend the service life of the bit
6. Drilling speed 250--400 recommended. Widely used to cut holes in
7. A variety of material like steel, wood, thin iron, aluminum alloy, insulation boards, PVC sheet, etc.