After reading all of the wonderful comments about these blades I went to HF and bought 6 pkgs. They were on sale. However I am very disappointed. The first two blades cut through a single layer only and leaving several threads uncut. The last two blades won't even cut through a single layer. I've tried turning the blades over thinking I may have put it on wrong. Anyone else have these problems? Bought them awhile ago and didn't save receipt so I guess I'll have to save my JoAnn's coupons and go invest in the real thing. UGH!