ok for starters i ordered regular blades and then i saw metal cutting blades so i ordered 4 of those non metal too . One arrived yesterday and I put one on my 4" x 6" metal band saw and while it's not made for cutting carbide it did it with authority, I cut 4 pieces of 3/4" steel and it cut pretty quick and perfect straight so im very happy boy if they cut that well the metal cutting blades should last a very long time i will be getting them on thursday 28th june 12 so just in case someone ordered them by mistake, don't worry, Marvin cuts perfectly