This set contains 2 saw blades for jigsaws (or rocker saws). They are suitable for working on hardwood and can cut through wood with a thickness between 4 and 30 mm. The blades measure 100x2.5 mm and have 10 teeth per inch. They fit on jigsaws from the most common brands that work with a U-shaft (e.g. Black+Decker, Power Base, Skil, etc.).