I found them to be of very poor quality. I suspect that almost 1/3 of the base block (the half that fits the hole you cut) was already bent and deformed when the package was opened. They're made of aluminum so light that I think they'll warp if you just put them in vinyl wrap. I sorted the stack, threw the misshapen one in the trash and used what was left. The ones that were in usable shape worked pretty well: the punch cut well and the crimping tool got the job done with ease. The finished eyelets looked professional. I just hate paying for things that aren't fully usable. Obviously, this increases the cost per unit of goods significantly.