Features: brand new and high quality Using high-quality high-carbon steel, wear-resistant, wear-resistant, and long service life. 3/8" 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. 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 Color: As Shown in the Picture Product Dimension: approx. 13.9x29x9.5mm/0.55x1.14x0.37inches Net Weight: 15g/0.03lbs 30g/0.07lbs Package Includes: 1PC/2PCS 3/8 Sleeve Extension Rod Accessories 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.