Factory installed storage rack upright base plates with holes for anchoring. Available in factory standard sizes and special order enlarged sizes. Seismic compliance of foot pads must be determined by a professional engineer. Sizes include: 3-1/4"w. x 4-1/4" d., 4" x 6", 5" x 6", 5" x 8" and 6-1/2" x 3/8" thick footplates. Uprights may be anchored to the floor by pre-drilling through the holes in metal footplate into concrete floor and securing with lag bolt anchors.