I was needing to engrave some keyring for my business, so I measured them and kept playing with the sizes after cutting a few out I eventually got to the correct size. I cut an A4 sheet out 14 keyrings then I stuck a plain sheet of basswood behind.
I measured my keyring which was 5cm high by 3cm wide.
I put a rectangle from shapes into xcs to that size, then I added a small circle for the bobbly bit then a larger circle for split ring.
I played around a few times then combined the shapes together.
I cut out a few shapes resizing in between and this one worked.
So I added 14 of them to an a4 sheet size and cut on my M1 10W power 100 speed 5 pass 1 on triangular prisms basswood 3mm setting.