There no such thing as a permanent cutting blade. To avoid costly or aggravating downtime stay sharp by keeping a spare blade handy at all times. Better yet, keep two blades on hand for twice the security. Skils 10-inch carbide circular saw blades are excellent for cutting all sorts of materials and keep their edge longer than conventional blades. --C. Dwight Barnett
Skil 2-Pack Carbide Circular Saw Blades