Oval Legirons High Quality Steel Bondage Legcuffs Leg Irons. These include two allen drive keys and two removable rings.
tem Details:

Cuff Height: 3/4"
Average Weight: 1.25 LB
Locking Position: 1
Key Type: Allen Drive
Finish: Stainless Steel
Key: Includes Two Allen Drive Keys

Ring Size: 1.0625"

Inside Diameter Comparison:

9" / 
Long Inside Diameter: 3.0"
Short Inside Diameter: 2.75"

10" / 25.4 cm:
Long Inside Diameter: 3.375"
Short Inside Diameter: 3.125"

11" / 27.94 cm:
Long Inside Diameter: 3.75"
Short Inside Diameter: 3.375"

ALSO AVAILABLE -- Matching Collar and Handcuffs:

Optional Extra Ring:                           Optional Extra Allen Keys: