1. The chuck can hold the drill bit tightly and firmly, not easy to loosen.2. Durable and has a long service life, suitable for long-term work.3. Easy to install and disassemble, more convenient and labor saving.4. Wide range of clamp sizes ranging from 2~13mm, suitable for many types of drill.5. Keyless and self-tightening design is more in accordance with human technology.Specification:Features:The chuck can hold the drill bit tightly and firmly, not easy to loosen.Durable and has long service life, suitable for long-term work.Easy to install and disassemble, more convenient and labor-saving.Wide range of clamp sizes ranging from 2~13mm, suitable for many types of drill bits.Keyless and self-tensioning design is more in accordance with human technology. Specification:Diameter: 43mm/1.69inLength: 58mm/2.28in (3-5mm tolerance)Connection size: 1/2-20UNFClamp range: 2 ~ 13 mm / 0.04 ~ 0.51 inchPackage List:1 x Drill ChuckNote:Before purchase, it is necessary to verify whether the connection thread of your electric drill is 1 /2-20UNF. (1/2 - 20 is the definition of thread specification. Specification: 1/2; number of threads (T): 20. UNF, UN is the standard code for thumb thread and F is fine thread).<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping!