The Standard Pier Adapter includes the machined flat plate, four machin900 Standard Pier Adaptered aluminum lock knobs with 5/16 x 1.5"OD flat washers, azimuth adjuster block, six 5/16-18 x 5/8" socket buttonhead screws and 5/16 x 9/16"OD x 0.060" flat washers. All machined parts are black anodized and the fasteners are stainless steel.