The Vintage Cast Iron Machinist's Surface Inspection Plate by The Challenge Manufacturing Co is a sturdy and durable tool for metalworking inspection and measurement. With a thickness of 2 inches and a width of 12 inches, this surface inspection plate offers a steel gray color that makes it easy to spot imperfections and irregularities on machined surfaces. Perfect for CNC machining, metalworking, and manufacturing applications, this vintage plate adds a touch of nostalgia to your workshop while providing accurate and reliable inspection results.