The Fein Reciprocating Saw is best used for cutting pipes with a diameter of 3-1/8" up to 24" (with chain extension) or cutting profile sections with a max width of 11-27/64" and a height of 21-11/16". The profile sections can be made of steel, cast iron, autoclaved aerated concrete, and plastic. It also has a cotinuous variable stroke adjustment to make cutting pipes or profile sections more of a controlled cut.