Using your Bosch T318A jigsaw blades is easy. First, make sure you've selected the right blade for your job. These blades are great for cutting thin metals and sheet metal. If you're using a jigsaw from Bosch, AEG, Dewalt, or other compatible brands, just insert the T - shank blade properly. When you start cutting metal, don't forget to use cutting oil, turpentine, or a mixture of turpentine and petroleum oil. This will keep the blade cool and make the cutting process smoother. Remember, these blades work best on thin metals between 1/16 and 1/8 inches and pipes or profiles with diameters less than 2 - 1/2 inches. After use, clean the blade with a soft cloth to remove any metal shavings. Store the blades in a dry place to prevent rusting. If you notice the blade getting dull, it might be time to replace it with a new one from the 5 - pack.