If you can get past the single side key hole, these are heavy-duty, quality stainless steel cuffs that are far superior to any out there, esp at this price offering. Buy them, you won't be disappointed.
I have 2 sets of s&w model 300 hinged cuffs. These cuffs blow them out of the water in finish and smoothness. I am a s&w fan for life when I pertains to their firearms but these chicago cuffs are so much smoother.