12"x18" Grade B Black Granite Surface Plate

This 12"x18" Grade B Black Granite Surface Plate is crafted from high-grade, non-porous granite for superior durability and a lifetime of service. Compressive Strength 7329 lbs/sq.in and Water Absorptivity 0.13%. No ledge and flatness tolerance of ±0.0001 inches.

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%. These plates have no ledge.
 

• Brand: STM
• Color : Black
• Material : Granite
• Overall Unilateral Flatness Tol. (Decimal Inch) : ±0.0001
• Length (Inch): 18"
• Width (Inch): 12"
• Thickness (Inch): 3"
• Grade: B
• Number of Ledges: 0