Grizzly G9650 9-Inch by 12-Inch by 3-Inch Granite Surface Plate, 2 Ledges
These tool room grade "B" Granite Plates have a bilateral accuracy of plus or minus .0001" total instrument runout for precision measurements form a common surface base. Granite Plates are harder than steel, non magnetic, least responsive to temperature changes, practically maintenance free and won't corrode like steel. Available with clamping ledges or without.