Gateway Bookbinding Systems - the makers of PLASTIKOIL® plastic spiral binding. Top quality binding - 45 different colors. Also offer Envirokoil® and PETG filament/coil. An extensive equipment lineup. Demonstrating their PLASTIKOIL® Concept QS2 Dual Interline system for in-house manufacturing and automated insertion of plastic spiral binding. Over 4 decades of experience. Gateway - The Plastic Spiral Experts.