12" x 6" and embossed. I did not take this off a machine so I cannot attest what its true purpose is/was. Has soot/dirt on it from wherever it was used but generally great shape. Cast Iron/steel (magnetic). Pricing as if it is real but since I did not take it off the device, please look at pics. Weighs 5-6 pounds. One poster wrote in and said he thought it was from a lathe.