U-Channel Sign Post by SmartSign, Medium Weight | 6' Tall Baked Enamel Steel Post - Pack of 3 PRE-DRILLED.U-channel sign posts have pre-drilled holes measuring 3/8 in diameter located at the top 30 inches of the post. MOUNT MULTIPLE SIGNS.Holes are 1 inch on center enabling you to easily align and mount your signs that are 12" x 18" or smaller. MEDIUM WEIGHT.U-Channel posts weigh 1.12 pounds per foot of length. INSTALLATION.Order with a portable sign base.Pack contains 3 posts. PROTECTIVE COATING. Baked-on green enamel coating enhances outdoor life and prevents rusting of the steel post.