i just saw some on Cookson's site (i think I ordered them today in
their findings sale that ends tonight!) Rio sells them too
They may not be called lobster clasps- but rectangular trigger
clasps by Cookson's, though Rio's are Sterling rectangular lobsters.
the thing to think about when designing using them is the connection
end: it is a long (relative to the size of the clasp) bar instead of
a jump ring or pad end.
I like them however particularly for men's items. There is also a
locking security clasp that is rectangular and pushes together, but
I'm thinking it's the rectangular clasp pictured below available from
most vendors on the web. same mass produced finding from EU to US and