"The Yellow Jacket center sections are part of an interlocking set of ramps and cable covers called AMS, or Advanced Modular System. The long sides of the center section contain male and female connections that support additional center pieces or side ramps. When connected with center pieces, a flat surface is created for pedestrians and vehicular traffic. When connecting side ramps, the flat prongs and slots are interlocked to create a tight, solid fit. Three separate channels offer protection to cables, wires, hoses, or a group of cables up to 2.25"" in diameter. All three channels are covered by a 0.375"" thick lid with reinforced fiberglass hinges. The hinged lid makes set up and tear down a cinch as the channels can be easily accessed. A surface covered in raised diamond treads maximizes traction for a high volume of pedestrians, mobility devices, carts and even buses. All center sections are made in the USA."