Yuil Model M-05 Stainless Steel Double Locking Thumbcuffs. These thumbcuffs are unusual in that they have separate keyholes and double locks for each cuff. The keys have a single small bit. The cuffs will not open with standard Yuil keys or universal keys. Weigh 2.8 ounces.
US export laws prohibit the export of thumbcuffs to all destinations including Canada and APO/FPO addresses.
A different style of Thumb cuff, December 12, 2017 By Erik (CA)
These thumb cuffs work well. They are relatively thinner than 'standard' model sold elsewhere. Because they require a non-standard key, these could be considered high(er) security. The motion is a bit rough thus far, but that doesn't affect usage.