ASP Hinged Handcuff with Black Aluminum Bow and 2 Pawl Lockset (Blue-Security) Flat Contact Surface with fully Radiused Edges, Serial Numbered Recessed Keyway on each side of cuff with blue Indicator double lock alert Replaceable 2 pawl high security lock sets; the two pawl key will unlock all standard handcuffs; standard handcuff keys will not unlock the two pawl lock set. Four Point Hinge Aluminum bows reduce weight by 15%