Features: brand new and high quality Hexagonal Socket Sleeve Extension Rod Accessories. 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. 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 . Using high-quality high-carbon steel, wear-resistant, wear-resistant, and long service life. 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: Chrome Vanadium Alloy Steel Color: As the Picture Shows Type: 10pcs, 14pcs, 5pcs set1, 5pcs set2, 6pcs, 8pcs Product Dimension: approx.6.35x65mm/0.25x2.56inches Net Weight: 440g/0.97lbs 750g/1.65lbs 210g/0.46lbs 170g/0.37lbs 280g/0.62lbs 320g/0.71lbs Package Includes: 1Set Hexagonal Socket 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.