Contractor Series Cobalt Bi-Metal Reciprocating Saw Blades. Lasts 10X Longer When Compared To Standard Carbon Alloy Blades. Unique Nitro Hardening Process For Optimal Strength And Blade Life. Fused Cobalt Teeth. 5% Cobalt Teeth Fused To Flexible, Shatterproof Body Fur Rugged Cutting. 1/2″ Universal Shank Fits All Popular Reciprocating Saws. 10T Width 3/4″ Thickness 0.035″. Application: Wood, PVC, Plastic, Composite And Nail Embedded Wood.