Modify Your Rolling TV/Monitor Cart for More Reliable Mobility from Room to Room. This heavy-duty caster set lets you roll your Tripp Lite rolling TV/monitor cart from one room to another, so you can safely, quickly and conveniently deliver your message directly to your audience. The DMCCASTER includes four swiveling casters, made from durable steel and measuring four inches in diameter. Each caster is specially designed for smooth rolling of heavy loads, even through doorways and across carpeting. A wrench is included for removing the stock casters from your rolling cart and installing these upgrades.