If you are looking for a surface plate that will allow you to check angles and parallelism, the SUBURBAN AP-444-S1 Angle Plate is just what you need. This 4 in. angle plate has four inches of width and depth, as well as four inches of height. It is finished with a ground finish, which means it can be used with almost any measuring device. With an overall length of 4 in., this angle plate comes with a 1-1/4" thick base. The SUBURBAN AP-444-S1 Angle Plate is an essential tool for checking angles and parallelism on your work piece or project.