• Standard • Installs at 60 pounds • Has 5/16" hex head screws • Conforms to ASTM-C1277
• Installs at 80 pounds • Has 5/16" hex head screws • Conforms to ASTM-C1540
• Large Diameter • Installs at 120 pounds • Has 5/16" hex head screws • Conforms to ASTM-C1277