The types of drill bits are divided into extra long wood drill bits, which are mainly divided into three-point drills, twist drills, gong drills, and flat drills.
Three-point drill: Woodworking three-point drill, suitable for general wood drilling, screw holes, round wood tenon holes, etc. I bought a special set of 20 yuan, a total of 8 from 3MM to 10MM, said it is export quality. There is also a small suit I bought before, it seems to be a four-pack or five-pack, the shorter one, and the gold-coated one, is also very easy to use. The three-point drill should be the best for drilling wood. It is easy to locate, does not move, and is cheap.
Twist drills: Twist drills are generally used to drill metals. Different metals have different materials. I have bought more than 20 twist drill bits one after another, and a few of them are different. Personal experience, it is better to buy a more expensive twist drill, one is worth ten.
Flat drill: The work of a flat drill is equivalent to scraping because the drill bit has only one piece of metal, which is perpendicular to the wood, so it acts as a scraper.