Gross Stabil's Panel Carrier is perfect for carrying: Wood, boards, doors, windows, panels, Metal (not greased), steel, stainless steel, varnished sheet metal, aluminum, brass, copper, synthetic and other materials. Automatic tension adjustment provides the right pressure for carrying materials. Unique swivel action of spring loaded heads allows clamping and carrying of different thickness of material. The panel carrier's rotating heads are rubber lined for scratch resistance and non-slip feature. Aluminum construction assembled by heavy-duty hardware and plastic handle fit comfortable in your hand. Designed to carry materials form the thickness of a razor-blade to 2-1/2" thick.