All Smith & Wesson handcuffs meet the NIJ requirement pertaining to strength. Smith & Wesson handcuffs are proudly made in Houlton, ME, U.S.A. MATERIAL – Carbon Steel FINISH – Nickel Finish WRIST OPENING – First Notch 2.04″ (5.2 cm) INSIDE PERIMETER – First Notch 8.4″ (21.3 cm) INSIDE PERIMETER – Last Notch 5.8″ (14.7 cm) INSIDE PERIMETER – Tightest 1.8″ (4.6 cm) NUMBER OF LOCKING POSITIONS – 23 DISTANCE BETWEEN CUFFS – 2.00″ (5.1 cm) MAXIMUM OVERALL LENGTH – 8.98″ (22.8 cm)