The Smith & Wesson model 300P push-pin double lock hinged satin nickel finish handcuffs. 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. MEETS NIJ STANDARD 0307.01 Specifications: Wrist Opening: 2.04 First Notch Inside Perimeter: 8.40 Last Notch Inside Perimeter: 5.80 Tightest Inside Width: 1.80 Weight: 10.0 oz Locking Positions: 23 Distance Between Cuffs: 2.00 Maximum Overall Length: 8.13 Two Keys Included