CHUCKchuck diameter is 43mm/1.69inch, length is 58mm/2.28inch, connection size is 1/2-20UNF, clamping range is from 2~13mm / 0.04~0.51inch, before purchasing, please confirm whether your hand drill is compatible with this electric drill chuck SELF-TIGHTENING CHUCK Durable and has a long service life, suitable for long time work. The chuck can hold the drill firmly and securely, not easy to loosen. Compared with traditional drill chuck, this keyless drill chuck will be easier to install and disassemble UNIVERSAL MULTIPLE QUICK CHANGE KEYLESS CHUCK 2~13MMWide range of collet sizes from 2 to 13 mm, suitable for many types of drills. 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 firmly and securely, not easy to loosen. You can use this product without much hassle. You don't need complicated procedures to use it.