The spirits bubble sets contains 4 different types of levels: Magnetic pocket , t , string line & circulars . This bubble comes with a compact box, which can easily store these small tools and is very convenient 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 convenient, 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. Package includes: 1Set Magnetic Spirits