Standridge Grade AA (Laboratory) black granite surface plate, 18x24x4.25". Ultra-precision flatness (~0.00005") for metrology/inspection. Threaded anchors on top for fixtures (note for unmodified use). Clean, no cracks, sold as-is, uncalibrated recently. Actual weight 160 lbs. Est ship weight/size. 200lbs/ 36x40x12
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