In this comparison, hand tightening the drill bit is a waste of time, and if the key to the electric drill is accidentally lost, it becomes even more troublesome. Self tightening electric drills are more convenient and do not require a drill key, but they require a lot of effort to control the drill bit, which can easily harm oneself if not careful. There is also a convenient and fast way to replace the drill bit. The WECKS 12V lithium-ion brushless impact drill WU131X only needs to rotate the chuck to loosen it, install the drill bit into the chuck, and then rotate the chuck to tighten it. By adjusting the tightness of the chuck, disassembly is convenient and safe. To ensure safe use, it is necessary to ensure that the cape and drill bit are installed in place.