This is a private cell owned and built by Yossie, the famous handcuff collector (see Yossie’s Handcuff Collection). It features concrete and rebar walls, and a 4-inch thick concrete reinforced ceiling. If you look closely you can see a loop of rebar protruding from the floor in the back corner of the cell, which is used for attaching chains. In this case the chain is attached to the prisoner’s collar and is of sufficient length to allow him to stand but not long enough for him to reach the barred wall and door of the cell. His collar is RIVETED on, and can only be removed with a power saw.
You can see more pictures of inmate Chuck in a posting titled “The Chain gang” at the Serious Male Bondage website.