Durable: The flexible extension rod set is made of industrial strength spring steel, the elastic rods are heat treated and forged for long term use, and the ball gate on the drive head allows you to securely lock the socket. Multiple size options: universal socket wrench for electric wrench, 10" long 1 or 2 (12.5 mm) drive, versatility is a great addition to any tool box. Flexible design: spring-loaded ball stops prevent workpieces from slipping in the machine, and the drive radius is square to reduce tool wear and socket. Ease of Use: Professionals rely on flexible extensions to quickly loosen out-of-step bolts and nuts, and in hard-to-reach places in light-torque applications. Productivity: Flexible drive sleeve extensions with tightly wound steel springs allow you to reach awkward angles up to 45 while maintaining good swing torque transfer. Make your installation work more flexible.