Our most popular blade, the 94-0186 high carbon steel blades are the perfect all-purpose single edge blade. Fitted with an aluminum back, these .009'' thick blades fit all standard razor blade tools. Each shipped blade is protected in shelling paper. These durable high carbon blades are used in a wide range of industries including janitorial, wallpapering, foam molding, optical, upholstery, auto tinting, and more.