With this accessory from the Pimp my folding rule series, you can use any standard folding rule based on the principle of a spirit level. Ideal for horizontal alignment of workpieces or pictures. The spirit level is made of high-quality, durable plastic. Simply slide it onto the folding rule and your levelling aid is ready for use. The water bubble shows you the correct alignment. A clever helper for house, home and hobby that fits in every drawer.