The Switch Multi-Blade Construction Knife is a Game Changer in the Construction Industry. The Torsion Spring Bin Case holds Ten Blades, Either Carpet Blades, Hook Blades and Standard Utility Blades. Basically all common blades fit into the Patent Protected Knife’s Unique Design. “The Switch” is an American manufactured product, that is made from 6061 Aluminum and the Bin Case is manufactured from from strong durable nylon. This Knife will save you hundreds of hours throughout your career compared to standard knives that are currently on the world wide market today. The Switch is currently the fastest Multi-Blade changing Knife in the World, Patented by David Low and Douglas Galloway with over two years of research and development to create this masterpiece of a knife.