The Model 700C-6X has additional links to accommodate individuals with larger upper bodies. The additional links give 5 1/2 inches of distance between the cuffs. The added space reduces shoulder, arm and wrist strain for larger individuals. The Model 700C-6X eliminates the need to link two sets of cuffs in order to restrain one individual. The Model 700C-6X uses Model 700C Handcuffs which have been approved by the National Institute of Justice. It now features an improved internal lock mechanism for increased tamper resistance, smoother ratcheting action and greater durability. Two keys supplied. Made in USA.