Panduit TMEH3S8-D350 Medium Duty Torque Mounts feature a retention tab within the mount bolt hole that creates interference to hold the bolt in different positions without any external assistance. They are made of Impact Modified Heat Stabilized Weather Resistant Nylon 6.6 and are ideal for heavy duty applications. Require a 5/16" (8mm) size bolt and can be used with miniature through wide strap extra heavy cable ties. For outdoor or indoor use, are black in color and come in packages of 500.