The machining tools for holes are: drill bits, scratch drills, boring cutters and other drill bits: you can drill holes directly on the surface of the object; Scratching: Holes with larger diameters can be processed (usually the diameter of the scratched drill is larger than the drill bit); Boring knife: first drill the bottom hole, and then use the brace knife to process, the diameter can also reach a large size. Now there are cutting machines that can also process holes, such as: water cutting machine waterjet can process holes, and wire cutting machines, EDM, laser cutting machines, etc. can process holes.