5 Pack, 4" , Progressor, High Speed Steel, T-Shank, Jig Saw Blade, Fast Cuts & Long Life In Thick Or Thin Metal, Pipes & Metal Profiles, Progressor Patented Tooth Design Is Ideal When Cutting Through Various Thicknesses Of Material, Designed To Cut Sheet Metal Up To 8 Gauge, Metal 5/64" - 3/8" , Stainless Steel 1/16" - 1/8" , Non-Ferrous Metal 5/64" - 3/4", Plastics 1/16" - 1 1/4" & Fiberglass 3/64" - 3/4" Thick.