Thanks so much! I think they are locking ones because they do have teeth at the handle end. I'll get a pair of non-locking, so I don't hurt Lilith. I've mostly been working on not being just a little grossed out by dead rats to be really systematic in how we hold it, but I will acquire more finesse as I learn more. (And we will not be getting a 7' constrictor anytime soon! It took me a couple of years to talk myself into getting a ball python, but my son adores her, so it's worth it.)