Due to the split shackle construction, the strength of the handcuff is increased because the gap between the dual shackles rides through a rigid "monorail" retaining bar. A double five-tooth pawl engages the independently floating retaining bars on each side of each shackle.
The "monorail" system is the reason we call the product TRI-MAX. The internal bar not only strengthens the hold vertically and laterally, but inhibits a shim from entering the nose or the rear of the shackle. It also defeats a pick if it is engaged through the keyway. While it may be possible to pop the double lock, a pick cannot go completely through the handcuff to engage the rear retaining bars and depress them. Tri-Max maintains the integrity of 1. Nose of shackle 2. Rear of shackle. 3. Key hole. That's why we call it TRI-MAX Security!
Uses standard handcuff keys, 2 included.