Features: brand new and high quality Using high-quality metal, wear-resistant, wear-resistant, and long service life. Various Specifications: 1/4" 3/8" 1/2" Extension Drill Bits Bar Bit Set Power Tools. Unique Design: the anti-dropping steel ball is better fixed: the self-locking device is not easy to slip or fall off and cause dangerous situations. double R groove design, greater bearing capacity. Usage: suitable for screwdriver handle or electric screwdriver tool (three-jaw chuck) to drive the sleeve. After installation, the joint can be converted into a square for head, which can be used for the installation of the sleeve. A powerful tool for conversion . Scope of Application: It can be used for installation on tools with shapes such as pneumatic screwdrivers, electric screwdrivers, air drills, electric drills, and manual screwdrivers. Specifications: Material: Metal Specification: 1/4, 3/8, 1/2 Product Dimension: approx. 58x12.5x6.35mm/2.28x0.49x0.25inches 50x10x6.35mm/1.97x0.39x0.25inches Net Weight: 25g/0.06lbs 30/0.07lbs 38g/0.08lbs Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Pc Socket Adapter 360 Degree Steering Adapter Rod