Pros : This is not a thin or easily broken wire for the actual key holding part, very sturdy and feels substantial.
The lip means it's also useful for resin
Cons : The bottom of the interior is totally smooth, which can make it a bit hard to secure the cab with just glue. I had an acquaintance who picked this for her project at a local maker craft place bring hers to me and she asked me re-glue it after it came apart in less than a week. I advised her it really needs epoxy to secure it in such a high use item, but it made me leery of kiln edged glass (ie. irregular) in such a high contact, daily use item, so I put in a lot of work to fit my glass and polish it down to a perfect cabochon.
Other Thoughts : While the smooth interior may be preferred if you want a shiny silver back to it for resin or a clear glass base, I really feel like it needs scuffing if you're going to adhere your glass with glue, and maybe even with a 2 part epoxy/resin
Over all I will likely purchase again