- Auto retract and fast vertical stability Equipped with a built-in spring-loaded system, this magnetic plumb bob automatically retracts the 6-meter cord with a gentle lift, eliminating manual winding. The steel bob stabilizes vertically within seconds to provide a reliable reference for vertical alignment. - Multi-surface magnetic adhesion The side-mounted neodymium magnet instantly adheres to iron beams, steel frames, or other metal surfaces, freeing your hands for measurements. For non-magnetic surfaces such as wood or drywall, use the fixed pin (press-fit, no hammering) or the hook hole for secure anchoring. - Durable, ergonomic construction Built with high-strength ABS engineering plastic, the body resists impacts, drops, and wear in heavy-duty use. The ergonomic design provides a non-slip grip, while the steel bob maintains long-term accuracy in harsh job-site conditions. - Versatile for professionals and DIYers Ideal for aligning steel structures on construction sites and for hanging shelves in home workshops. Suitable for masonry, drywall installation, door and window fitting, and furniture assembly. Its compact size and 6-meter cord cover both tight spaces and larger projects. - Typical applications Align steel frames and verify verticality when mounting walls or fixtures on construction sites. Hang shelves, cabinets, or other fixtures in home workshops with precise plumb reference. Assist masonry or drywall installations and door/window fitting by providing stable, reference plumb lines on metal or non-metal surfaces.