Draper Expert Bi-Metal Hacksaw Blades, with Detachable Blade Grip, Dual Adjustable Blade Blades, and 5.5mm Dual Tapping Cylinder Blades are designed with cutting edge precision in mind, making them the perfect choice for cutting edge blades and sharpening their edge-slip blades and laser cutters. Professional and Certified Designists have crafted cutting edge Blade/Cylinder Blades so you can enjoy your knives faster, more accurately and cut with greater rigor and efficiency, providing a perfect cut and feel. The PPA and DAPL are certified and in compliance with NFPA and NFPA Technical Regulations, which stipulate that blade performance and durability can and will depend on your cutting edge blades and precision machining skills and tools. Made in the U.S.A. only For manufacturing only. Not compatible with any other blade manufacturers.