Stainless steel heavy ankle cuffs. Keyed lock with tumbler. Smooth finish. Connected with a heavy chain. 
 
Small Measures:
Inner Diameter: 2.5 Inches
Height: 1.58 Inches
Thickness: .80 Inches
 
Large Measures:
Inner Diameter: 3.0 Inches
Height: 2.25 Inches
Thickness: .80 Inches