For project shown, cast-iron wheels were sourced at a local metal salvage yard for $10 apiece. These wheels were originally mounted to the face of a door and rode on a floor-mounted half-round piece of metal track. Although rusty, the wheels were still fully operational and revealed a nice black oxide patina when brushed with a wire wheel. Rust behind the wheel added an interesting color tone. DIY hangers were required to top mount (hang) the door.