Features: This versatile double head auto locking wrench replaces multiple tools, handling nut from 10-27mm and round pipes with ease, ideal for professional and DIYers. Crafrted from high carbon steel for exceptionally durability and hardness, the wrench features an innovative large opening spring auto lock mechanism that automatically grips various nut securely without manual adjustment. Designed for professional mechanics tackling heavy duty jobs and DIYer enthusiasts performing home or auto repairs, this reliably tool delivers consistent performances. Tackle demanding tasks in confined spaces effortlessly; the wrench's large 41mm opening and auto locking action make it perfect for plumbing, automotive work, and large equipment maintenance. Its corrosions resistant finish, achieved through precise polishing and protective oil coating, ensures long lasting, dependable performances even in harsh or humid industrial environments. Specifications: Component: high carbon steel Maximumly opening:41mm Applicable nut ranging:10-27mm Size:Approx.160x30mm/6.29x1.18inch Size:Approx.216x30mm/8.5x1.18inch Size:Approx.266x40mm/10.47x1.57inch Size:Approx.306x41mm/12.04x1.61inch Package Includes: 1pcs Auto Locking Wrench note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.