High speed steel blades. 1/2 universal shanks. Ferrous/non-ferrous metal over 1/8, s/s/ tube, pvc, cast pipe and nail embedded wood. Product Features:Used for ferrous and non-ferrous metal over 1/8-Inch stainless steel tube PVC cast pipe and nail embedded woodMade of high speed steel1/2-Inch universal shank fits all popular reciprocating saws