"No Drill installation" and We come with instruction, and this kind wire management tray is screw free, for your home desk, Wood, glass, metal and marble tables can be used, and are easy to dismantle, leaving no marks or damage to the table. Soft rubber pads on adjustable and removable clamps protect your desk or table from scratches. No Dust Accumulation, Anti-overheating, Flexible cable adjustment, Extra large capacity. Made of powder-coated carbon steel for long life, this new wire hiders which is quiet stable, Hollow curved design cable management tray under desk can easily hold power strip and more easy to organize cable wires.