This set includes three professional box spirit levels measuring 600mm, 1200mm, and 1800mm, along with a 250mm magnetic boat level. The box spirit levels are made of aluminum and come with three vials - a 180 Degree domed/arc center vial and two 90 Degree vials. They have a milled face on the underside to ensure maximum flatness and high accuracy. The vials are UV and shock-resistant, and the embossed rubber end caps provide added protection. The boat level is made of die-cast aluminum with a powder-coated finish and strong magnets in the base. It features two UV and shock-resistant vials - 180 Degree and 90 Degree. The accuracy is 0.5mm in a standard working position. For portability, these levels are supplied inside a strong padded storage bag.