NT Hook shaped plastic cutting blades for Multi-Use Plastic Cutter, M-500P. Hook blades are designed to scrape plastic surfaces to reach enough depth to snap apart. This blade of the plastic cutting tool is made from high quality chromium and tungsten added carbon tool steel for higher abrasion resistance and produced through multiple stages of precise process to obtain the ultimate sharpness and optimum edge-retention. 6 blades per pack in a protective plastic hanging case. Good for both personal DIY projects and industrial applications such as construction work and factory operation. Made in Japan.