Similar to a police issue handcuff, this lock is designed so that one cuff slips around the frame and the other around whatever you’re locking it to.
We tried to break it with our standard tools and it passed with plenty of damage but still in working order. We then tried larger bolt croppers and cut through a cuff in 1min 48sec.
This is dependent on the cuff chain being exposed, though. Lock with the ﬁxed side facing out and it won’t open even when cut.