This Bosch Edge RECM9X2 sawzall blade is the prime choice for heavy metal cutting. The durability in this 14+18 variable TPI blade insures extra long life. Turbo-Teeth Tecnology lasts up to 3X longer than standard reciprocating saw blades. Swiss made out of premium material engineered for extreme cuts and to stay sharp. The cost savings in the bulk package will leave you with no regrets.