Tri-point drill: Woodworking tri-point drill, suitable for general wood drilling, screw holes, log tenon holes, etc. The small set I bought before seems to be a four-pack or five-pack. The shorter ones are gold-coated, and they are also very easy to use. The three-pointed drill should be the best for drilling wood, easy to locate, not out of place, and cheap.

Twist drill: Twist drill is generally used to drill metal, and drill different metals and have different materials. I have bought nearly 20 twist drills successively, some of which are not concentric, and when the drill is clamped, it starts to shake. From personal experience, it is better to buy expensive twist drills, one is worth ten.

A gong drill has two blades, one is responsible for making a circle, which is equivalent to the role of a chisel, the other blade is responsible for shoveling the material, and a small screw in the middle is used as the center of the positioning circle. The holes drilled by the gong drill are relatively neat, without burrs, and the drilling speed is also fast. Generally, the gong drill is relatively long and is used to drill deep holes.

Attention should be paid to the operation: because the contact surface between the drill body and the wood is large, the heat generated by friction is relatively large. If it is a relatively hard wood, it is often smoked. If the drill bit is not taken out in time to cool, the drill bit will even be annealed and not hard.