DRILL CHUCK: Drill chuck diameter is 43mm/1.69inch, length is 58mm/2.28inch, connection size is 1/2-20UNF, clamping range is 2~13mm / 0.04~0.51inch. Before purchasing, please confirm whether your hand drill is compatible with this electric drill chuck.SELF-TIGHTENING DRILL CHUCK: Durable and has a long service life, suitable for extended use. The chuck securely holds the drill bit and is not prone to loosening. Compared to traditional chucks, this keyless drill chuck is easier to install and remove.2~13MM KEYLESS CHUCK: Features a wide collet size range from 2 to 13mm, compatible with various types of drill bits. Easy to use and ideal for industrial applications.KEYLESS HAND DRILL CHUCK: Simple to install and remove, offering convenience and cost-effectiveness. The keyless, self-tightening design is ergonomically optimized and fits multiple drill bit types to meet diverse needs.HAND DRILL CHUCK: Securely holds drill bits without loosening. Designed for hassle-free operation without complicated setup procedures.