Reciprocating Blades A Reciprocating Sabre saw blade is used for cutting through various materials such as wood, metal, plastic etc, cutting through material with a push and pull motion of the blade. 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.Most manufacturers including Bosch, Dewalt, Makita etc use a standard universal fitting, which makes it easier to switch blades between different machines. Most sabre saws are now fitted with a tool-less blade change to make swapping blades faster and easier.The 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.