Folds flat for compact storage Improved internal lock mechanism for increased tamper resistance Rust resistant EPP finish The hinged design provides additional restraint by more effectively restricting hand and arm movement. The Model 850C has the ability to fold flat for compact storage. It has a 10% larger inside perimeter then the Model 700C and Model 750C. The color finish helps to prevent equipment loss by allowing individuals, agencies or departments to more easily identify and track property. Color can also be used to enable or reinforce a classification system such as threat level, medical condition, jurisdiction and more. The color coating is applied using a process called Electrolytic Polyurethane Plating (EPP). EPP fully coats restraints inside and out without interfering with the lock mechanism or jaw swing-through. The durable EPP finish is resistant to chipping and scratching. The rust resistant EPP finish exceeds the National Institute of Justice&';s 12 hour salt spray testing standard. The Model 850C features an improved internal lock mechanism for increased tamper resistance, smoother ratcheting action and greater durability. Other features incorporated spun rivet construction and push pin double lock capability. The Model 850C is National Institute of Justice 0307.01 certified. Two keys supplied.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }