1.[Strong Magnetic Design]The retractable plumb bob line features a powerful magnetic design that allows it to be easily adhered to iron surfaces, making it an essential tool for construction industry assignments. 2..[One-Click Quick Stabilization]With its needle fixed in place and a convenient one-click press mechanism, the plumb bob with string retractable ensures quick fixation for accurate alignment during your projects. 3.[Protective Locking Switch]Equipped with a protective switch, our magnetic plumb bob with retractable line allows you to lock the needle securely, preventing any accidental movement while working on your construction tasks. Size:As the pictures show Package Included:1Pc Note: Due to manual measurement, please allow an error of 1-3mm. As different computers display different colors, thank you for your understanding, the actual product color may be slightly different from the image.