Premium drill chuck: it holds the drill bit firmly, is not easy to lose, durable and sturdy; it is perfectly suitable for long-term use and has a long service life; Wide application: this chuck features a wide clamping range of 0.04-0.51 inch, a connection size of 1/2-20 UNF, it is suitable for many types of drills; Reasonable design: this is a keyless chuck; the keyless and self-locking design is more in line with human engineering; Easy to use: the manual chuck is easy to install and disassemble, saving effort and making it more convenient because it does not require complex operations.