Steel Force SF956C Reciprocating Sawzall Blade are made with high speed steel teeth containing 8% cobalt to keep a sharper tooth edge for a longer lasting and more durable use. The tough bi-metal design allows for faster cutting, sturdier blades that can bend without shattering. Materials, tooth configuration and heat treating are designed to maximize performance in specific cutting applications. This 5-pack of 9 in. 5 TPI SAWZALL Reciprocating Saw Blades have a 1/2 in. universal tang that fits all SAWZALL and standard competitive saws.