Very Sturdy!
I use these as anchor points for my bed restraint kit and they're very handy! I used four 75cm straps around my bed frame so they have enough length to come up to the top of the mattress. Together with some rope and good quality leather cuffs, this makes for a very sturdy and secure restraint. You can put a lot of force through them and they don't feel like they're going to break. Overall, very impressed.