NOS, see pictures, selling a set of 4 never used in original boxes.

The mounting plate is 4 inches x 2 3/4" and the mounting holes are 3" x 1 3/4"

The Noelting Faultless 400-3 is a classic, heavy-duty industrial swivel caster, historically manufactured by Faultless Caster. Known for its durability, it features a 3-inch wheel diameter, often paired with a 1.5-inch tread width and a side-lock plate. It is highly sought after for restorations, toolboxes, and vintage furniture

Key Specs & FeaturesWheel Diameter: 3 inchesMounting Style: Top plate or side-lock plate mountingBuild: Known for its heavy-gauge steel frame and hardened ball bearings Load Capacity: Typically ranges between 150 to 200+ pounds per caster, depending on the wheel material (e.g., polyurethane, hard rubber, or steel)