CMT JS1210VF 5 Reciprocating Saw Blades for Wood & Metal BIM 12" x 5 8TPI (5 Pc) Deck Drive DCU COMPOSITE Screw (Collated) which is especially valuable when which is especially valuable when boring through melamine faced chipboard or veneered MDF where surface quality matters The integrated guide prevents over cutting past the panel face into the substrate a critical advantage when making electrical box cutouts or precise panel openings where substrate damage is not acceptable Bi Metal (BIM) Construction the high speed steel teeth bonded to a flexible backing provide superior wear resistance and extended cutting life compared to carbon steel only blades Wood and metal wall cutouts