The Surface Mount system is a unique solution for installation of an Arbor onto cement or concrete. You will not need to dig holes to mount your arbor into the ground. Simply screw the surface mount to the concrete, slide the plastic biscuit over top, and slide the arbor over the biscuits. Screw them into place and installing your arbor has never been easier. The Surface Mounts are made of galvanized steel and ABS plastic to provide a secure and lasting anchoring system for your arbor. They sleeve up the arbor 8 inches. Each kit contains 4 surface mounts for a complete arbor solution.