Features 1. Made from high-quality chromium vanadium steel for enhanced torque and superior hardness. 2. Hardened sockets provide increased rotational strength and reduced wear. 3. Offers excellent rust and corrosion resistance, ensuring durability and long-term use. 4. Precision chamfered bit ends allow for smooth insertion; socket sizes are clearly marked for easy identification. 5. Versatile application for household and automotive tasks; practical and convenient to use. Specification Item Type: Hex Key Wrench Bit Socket Set Material: Chromium Vanadium Steel Toolbox Color: Blue Toolbox Size: Approx. 220x113mm / 8.7x4.4in Square Wrench Interface Size: 3/8 inch Hex Bit Size: H3, H4, H5, H6, H7, H8, H10 (H in the hexagonal bit size indicates millimeters, referring to diagonal measurement; for example, H3 equals 3mm) Total Length of Hex Bit: Approx. 110mm / 4.3in (Manual measurement may result in a 1-2mm deviation) Application: Compatible with 3/8 inch square wrench interface, air wrench, and power rod Usage: Suitable for household and automotive applications Package List 7 x Socket Bit 1 x Toolbox