Smith & Wesson model 300P push-pin double lock hinged satin nickel finish handcuffs, 2 keys included. Double hinged design to further restrict movement for special applications. Has push-pin double lock for increased security. Hinged handcuffs are difficult to escape from even if the subject has the key. Some people consider push-pin models easier to double lock, especially in dark conditions. The inner perimeter measures 5-3/4" to 8" with 22 locking positions. Includes Smith & Wesson's lifetime warranty and instructions.