The Bolt Down Bracket System enables Vita pergola owners to mount their pergola safely and securely to a wood deck or cement patio. Simply measure your footprint and bolt the galvanized steel brackets into place. Insert 4"x4" pressure treated wood posts (must be purchased separately) into the brackets and screw them in place. Slide your pergola posts over the wood posts, and screw the pergola posts into the wood. The result is a lasting installation that is safe and secure. This mounting system was specifically designed for Vita brand pergolas. We highly recommend that if you are installing a Vita pergola on a flat surface, you purchase this kit. The mounting system includes 3 galvanized steel brackets and the necessary 1.5" (3.8cm) self-tapping screws for securing the wood posts. Important Note: DO NOT use the bolt down bracket system for installing the pergola over concrete pavers, patio stones, or interlocking bricks. Please note: extra materials and hardware are required to install the Vita pergola with the bolt-down brackets. Please review the pergola installation guide for more details.