The 2in. aluminum cap fits over the top of a 2in. x 8ft. square signpost (SH30) and features hex set screws to tighten the cap securely into place. Hex set screws are adjusted with a 5/32in. hex key, or allen, wrench. Post caps are necessary to prevent injury from the sharp steel edges of a signpost and to give your signpost a finished and clean look. The caps are finished with a glossed black paint. Sold individually.