STM Black Granite Surface Plate, Grade A, 18W x 24L x 3H – 255-135

• These plates are made of the highest quality True Black Fine Grained Non-porous Jewel Hardness Granite available to give years of long lasting service.
• Specifications: Compressive Strength 7329 lbs. / sq.in,
• Water Absorptivity 0.13%.
• Grade A – Inspection

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