Bimetal High Speed Jigsaw Replacement Blades (5 Pack) for Makita Hitachi Ryobi B & D Features: The blade edge is cobalt high speed steel, and the back is made of a special spring steel bimetal construction. It is hard to break and chip resistant, so you dont have to worry about replacing. Suitable for a wide variety of materials Uses: For cutting mild steel plates, stainless steel, plywood, plastic sheets, etc. Specifications: Electric Motor: Jigsaw