This Over/Under Pier set contains two each of 12 graduated concrete piers plus Straight Pier Girder. Pier heights range from 9/64 inches through 1 1/16 inches by 9/64 inches increments. Grade with piers spaced at 5 inch intervals is 2.8%. 25 Pieces. Includes: Two each of 12 graduated concrete piers plus one Straight Pier Girder (#ATL2542).