One pair of Steel Mitt Handcuffs. These mitts lock via an Allen type lock and feature a comfortable inside the gripping handle. For additional security, there are also holes for using an optional bolt or padlock (not included). 

The mitts have built-in hooks for... your imagination. These are include one key. 

Two Sizes: 6.5" & 7 5/8 (Inside Wrist Circumference)
Features: Inside Steel Rod Gripping Handle
Finish: Stainless Steel
Lock/ Locking Positions: Allen Type Lock
Key: One Allen Style Key