This bubble comes with a compact box, which can easily store these small tools and is very to carry There is a magnet at the bottom, which can be adsorbed on the top or bottom of iron items, making the measurement more accurate and Perfect for woodworking projects, furniture installation The T Bubble is precise, and provides for front-to-back or side-to-side leveling, with 2 optional screw holes for permanent mounting or apply adhesive for mounting The String Line is lightweight, and resistant to wear. With moulded hooks to enable the to be hung from a builder line.This bubble is accurate, and lightweight, it can be used for leveling the position of telescopes, tripods, cameras The spirits bubble sets contains 4 different types of levels: pocket t string line & circulars, Manufacturer: SkyPOOU