Winzer 30 Piece ShopPro Hacksaw Blade Assortment DrawerA hacksaw blade is mainly used for cutting metal, plastic, and sometimes wood. Ultra Bi hard cobalt high speed steel construction, Flexible body resists shattering for safety, Raker set teeth avoids pinching, gives more chip clearance and ensures a large cutting width for smooth cutting action. Addition of cobalt gives hardness and heat resistance to the teeth to retain their cutting edge even where temperatures can reach 1100 F Suitable for materials