I use two kinds of clasps in my work.
SNAP CLASP or BALL & HITCH
People are always surprised with these clasps; they've never seen them before! And when I show them how it works, they are A-Mazed.
It's simple. The BALL snaps into the HITCH (loop). They are strong, secure, and easy to use.
I use this clasp for all single strand pieces.
This clasp is a little more widely known, and is just as simple.
One tube is larger than the other, and they slide together. Or grab it at each end and they slide apart.
I use this clasp for multi-strand pieces that terminate at the clasp.