Features: Multi functional conversion: This 1/2inch or 21mm hex wrench conversion adapter can connect wrenches of different specifications, providing conversion and adaptation functions, making it convenient for users to use in different work tasks. Good quality manufacturing: good quality materials with good strength and durability, ensuring a long service life. Precise designs: Through precise design, it ensures a tight connection between the wrench and adapter, reducing the risk of sliding and failure. 2 function adapter: It can be converted into two hexagonal wrench sizes, 1/2inch and 21mm, to meet the work needs of different sizes and increase work flexibility. Hexagonal Connection Design: Adopting a hexagonal connection design, providing a more secure and stable connection, avoiding the wrench from sliding or falling off during operation. Chromium plating treatment: The surfaces treated with chromium plating has strong corrosion resistance, is easy to clean, and provides a bright appearance Specifications: Size:approx 80x44mm/3.15x1.73in Material:Carbon Steel for 1/2 Inch or 21mm Hex Wrench Note: Due to the problems of lighting effects and shootingangles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1Set Wrench Extender