diameter:2",3",4",5" finish of braket:Zinc,Chrome,Nickel plated material of wheel:ESD,rubber,PU,nylon,artificial gum types:plate caster,threaded stem caster,flat swivel caster,flat fixed caster.Usages: used in the products which need to be moved, such as: turnover cart, worktable, and often used with the swivel casters with brake or without brake. plate Nylon caster with brake/without brake