CTS Thompson Model 1108 Tri-Max Oversized High Security Nickel Chain Handcuffs. Same as Model 1003, but with high security Tri-Max lock system. Positive "clickback" backloading system. Oversized for larger wrists. Inside perimeter: 6.25" minimum, 9" maximum. 2 handcuff keys included. Weigh 11 ounces.