New old stock - steel and cast iron caster wheels. As new hardware, with age, but no use. Four holes to attach to whatever project your heart desires! Part number reading 16 and 17 clearly cast into the wheels. Available individually or in sets of four. Price per each. Measurements: 3 inch diameter wheel x 1.5 inches wide, sits 3.75 inches tall, 4.25 inch bracket length, 2.25 inch bracket width.