Wide Range of Uses, Professional and Effective: This retractable plumb bob is a powerful assistant in of construction and decoration. Whether it is a professional or an amateur DIY enthusiast, it can accurately test verticality. Its magnetic plumb can be firmly attached to iron surfaces, cement walls, gypsum boards and wooden surfaces, greatly simplifying the workflow and suitable for various scenarios Multi-Faceted Connection, Flexible Response: Facing the working environment of the iron , the magnetic block exerts a strong adsorption force and fits tightly with the iron ; when working on wood or other non-iron surfaces, it can be firmly fixed on the wooden using the positioning hole or fixing pin, and it is easy to handle working scenes of various materials Flexible and Retractable, Fast and Stable: It has a practical retractable function. Through precise resistance adjustment, it can adapt to plumb of different specifications from 5oz to 16oz, and can maintain balance quickly and stably in a short time. During operation, just lift the plumb lightly and automatically retract, which is efficient and convenient Easy to Operate and Accurate Measurement: The method of use is extremely simple. Just keep a suitable distance from the wall and pull down the plumb to determine the verticality. By measuring the distance between the two ends of and the wall, you can quickly determine whether the wall is vertical. With a few steps, you can easily get accurate results, Manufacturer: PokFhgur