SAFETY TIPS Always use sharp blades. A dull blade requires more force and is more likely to slip than a sharp one. Change the blade whenever it starts to tear instead of cut. Protect your eyes - wear safety goggles when working with blades or any other tools. Always keep your free hand away from the line of cut. Don't bend or apply side loads to blades by using them to open cans or pry loose objects. Blades are brittle and can snap easily.