Part Number 1111-960854 identifies an Aero (OEM) 4" Rear Idler Roller. This component is a vital part of Aero Industries cable tarp systems, such as the Top Glide Pro and Crank-N-Go 3 systems. It's a roller, likely made of durable composite plastic, that guides the cables at the rear of the tarp system. This 4-inch roller ensures smooth operation and proper tensioning of the cables, facilitating the efficient movement of the tarp.