The automatic buckle is the most common type of buckle. At the bottom, there is a small circular magnet and an iron fastener combined to generate elasticity. Pulling the transmission rod on the side can separate the rocker from the magnet. At this point, the watch can pass through the middle. After adjusting to the appropriate position, release it. At this time, the strap will be stuck under the effect of the magnetism. If it is pulled apart again, the belt can be freely pulled out once more. When the transmission rod is released, the watch will automatically get stuck, so this type of clasp is called an automatic clasp.

The pin buckle has a flat pin in the middle of the buckle head. There is a row of holes at the back of the watch. When the watch is wound around once, insert the pin into the holes, and it will be stuck. The structure of the pin buckle is relatively simple and it is also easy to use. It is one of the most commonly used buckle types.

The key feature of the clasp is that there is a hook with a round bead in the middle of the front part of the watch clasp. When the watch is wound around once, the hook is hooked into the round hole at the tail of the strap body, and thus it is securely fastened. There are many shapes and structures of this kind of buckle with hooks, but we collectively refer to these watch clasps with hooks as plate clasps.

The most commonly used material for making watch clasps is zinc alloy. It is formed by melting zinc alloy in an injection molding machine and then casting it into shape with a mold, followed by various post-processing techniques such as polishing and electroplating. In addition to zinc alloy, some also use copper as raw material. After post-processing, copper buckles can achieve better luster, hand feel and durability, but the cost is relatively much higher. Secondly, the proportion of stainless steel used as raw material is also increasing. High-grade stainless steel has a very high-end texture, but low-grade stainless steel has a rough texture, and its luster and hand feel are not ideal, so it is not suitable for use. High-grade stainless steel is very expensive and difficult to process, so it is hard to be of common grade. In addition, there are some that use tin alloy or iron as raw materials, but due to their poor texture and less-than-ideal surface treatment, they are often used in low-end products or fast-moving consumer goods.

The surface treatment of watch clasp, polishing, and the formed clasp head usually have many sharp edges and corners, and the surface is also relatively rough. Therefore, polishing it is a very important step. At present, this process is almost all done manually, so there is a significant difference in the fineness of polishing. To a large extent, the quality of a buckle's workmanship is reflected in this aspect.