Locking D cuffs.
Secure & Comfortable - round tube construction
Comes with extra keys
 
Available in 2 Sizes
 
Small: 
1.92  Inches (Interior top-bottom per cuff)
1.65 Inches (interior side to side per cuff)
 
Large: 
2.75 Inches (Interior top-bottom per cuff)
2.0 Inches (interior side to side per cuff)