Alumicolor Straight Edges with Center Finding Backs are really two rulers in one. The front side of each is calibrated in inches and millimeters while the back side has center finding calibrations in inches. They have ultra smooth edges and photo anodized calibrations that resist cleaning or rubbing off.

These are excellent, low priced, yet high quality rulers for every day use. They are made of sturdy, rigid aluminum and are 36 in. long x 1 1/4 in. wide x 1/8 in. thick.