This set includes 600mm, 1200mm, and 1800mm professional heavy-duty box spirit levels. Each is made from aluminium and has three vials. They feature a milled top and bottom surface for maximum stability and precise accuracy. The levels have a 180 Degree domed/arc center vial and two 90 Degree vials. The vials are UV and shock-resistant, and the embossed rubber end caps provide added protection. For ease of use and portability, they include an integrated anti-slip handle. Hang holes are available for convenient storage at both ends. The accuracy is 0.5mm in a standard working position. These levels are supplied inside a strong padded bag with a handle and three storage pockets.