Jigsaw Blades A jigsaw blade is used to provide a great deal of accuracy when cutting through various materials such as wood, metal, plastic and ceramic. It is important to select the correct blade for the type of material being cut to ensure the best finish without damaging the blade or tool. Available in a range of lengths depending on the thickness of the material, longer jigsaw blades tend to be thicker to prevent bending whereas the thinner shorter versions make it easier to cut curves and patterns.Most manufacturers including Bosch, Dewalt, Makita etc are now using T-shank blades as standard, which makes it easier to switch blades between different machines. U-shank blades are still available but the T-shank has become more popular as most jigsaws are now fitted with a tool-less blade change to make swapping blades faster and easierThe number of teeth per inch (TPI) will determine that type of material it can cut. Lower TPI delivers faster cuts and is best used for cutting wood. Higher TPI delivers slower, finer cuts so are best used for cutting metal.