DRILL CHUCKdrill chuck diameter is 43mm/1.69inch, length is 58mm/2.28inch, connection size is 1/2-20UNF, range clamping range is 2~13mm / 0.04~0.51inch, before purchasing, please confirm whether your hand Drill is compatible with this electric drill chuck! DRILL CHUCK SELF-TIGHTENing Durable and has a long service life, suitable for long time work. The chuck can hold the drill bit firmly and securely, not easy to loosen. Compared with traditional drill chuck, this keyless drill chuck will be easier to install and disassemble! 2~13MM UNIVERSAL MULTIPLE QUICK CHANGE KEYLESS CHUCKWide range of collet sizes ranging from 2 to 13 mm, suitable for many types of drill bits. Easy to use, it is an industrial accessory for you to choose! KEYLESS HAND DRILL CHUCKEasy to install and disassemble, more convenient and economical. Keyless and self-tightening type design is more in line with human engineering. suitable for many types of drill bits. Which can meet your needs. HAND DRILL CHUCKThe chuck can hold the drill bit firmly and securely, not easy to loosen. You can use this product without much hassle. You don't need complicated procedures to use it.