I designed and constructed this set of handcuffs. The main body of each cuff is made of two pieces of 1 1/4" x 1/4" flat steel for a total thickness of 1/2". The inside of the cuff measures 2 1/8" across and the distance from the bar to inside top of the curve can be adjusted to 3 1/8", 2 5/8" or 2 1/8". The distance between the cuffs with the chain fully extended is 8". The weight is nearly 4 pounds with padlocks (pictured and included). The finish is brushed steel with a coat of wax added to help prevent oxidation. - eBay
They went for $142.50. Not bad.