The classic design is new and improved. Our handcuff features an improved internal lock mechanism for increased tamper resistance, smoother ratcheting action and greater durability. Our handcuffs incorporates spun rivet construction, push pin double lock capability and two types of finish to choose from nickel and stainless steel. Two keys supplied. Our handcuffs are National Institute of Justice 0307.01 certified and comes with a LIFETIME warranty for manufacturer defects.