Review on 50 Pack Of Heavy-Duty Bi-Metal Reciprocating Saw Blades With 8% Cobalt, Universally Compatible In 6" And 8" Sizes, Complete With Plastic Carrying Case - 18 TPI, 8" X 3/4 by Nick Whitman

The set I received cut through a 2X4 easily and quickly, can't complain. Then I tried cutting through a smaller, thin wall metal tube, the blade cut it, but took a bit get actually get started. Once it got started it cut okay. So, the set I have will be better for wood cutting, not as good on metal. Least from my experience with them. Sure the number of teeth makes a difference.I am really into woodworking and do all home repairs and remodeling, so this set will do me fine. Overall I think they are good for wood, rough cutting and related, plus the price is pretty good for all the blades you get. They will last me a long time.