Specification: Diameter: 43 mm, Length: 71 mm, Link size: 1/2-20UNF, Clamping range: 2 ~ 13 mm / 0.04 ~ 0.51 inch Wide Range of Sizes: Wide range of collet sizes from 2 to 13 mm, suitable for many types of drill bits Good Workmanship: Keyless and self-tightening design is more ergonomic. The multi-purpose self-tightening chuck can hold the drill bit firmly and securely, not easy to loose Easy to Install and Disassemble: This multi-purpose self-tightening drill chuck is easy to install and disassemble, making it easier and less laborious Durable: The drill chuck is durable and has a long service life, suitable for long working hours < p>Feature: The chuck can hold the drill bit firmly and securely, not easy to lose. Durable and has a long service life, suitable for long time work. Easy to install and disassemble, more convenient and less laborious. Wide range of collet sizes from 2 to 13 mm, suitable for many types of drill bits. p> The keyless and self-tightening type design is more in line with human engineering. Portabrocas autoadjustable para mltiples propsitos Specification: < p>Connection size: 1/2-20UNF Clamping range: 2 ~ 13 mm/0.04 ~ 0.51 inch Package list: 1 x chuck< /p> Portabrocas autoadjustable para mltiples propsitos Diameter: 43 mm/1.69 in Length: 58 mm/2.28 in Portabrocas autoadjustable para mltiples propsitos 1/2-20UNF Montaje 1~13 mm Wide range of sizes Wide range of accessory sizes, ranging from 1 to 13 mm, suitable for a wide range of drills