Features: The use of high-quality high carbon steel, wear-resistant, wear-resistant and long service life. 3/8" extension drill bits power tool parts set. Unique design: anti-drop steel ball is better fixed: the locking device itself is not easy to slip or falling off and causing dangerous situations. R-groove design, higher load-bearing capacity. Scope of application: can be used for installation on shape tools such as air screwdrivers, electric screwdrivers, air drills, electric drills and hand screwdrivers. Technical data: Material: high carbon steel Color : as shown in the picture Product dimensions: approx. 7 x 1.5 x 1cm/2.76 x 0.59 x 0.39inches Net weight: 60g/0.13kg Application: Suitable for screwdriver handle or electric screwdriver tool (three jaw handle) to guide the sleeve. After installation, the connector Can be converted into a square head that can be used to install bushings.Powerful conversion tool. Package includes: 1PC Long Sleeve Extension or 2pcs Sleeve Extension 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.