Granite surface plates:BoHai granite surface plates provide an accurate reference plane for work inspection and for work layout. Their high degree of flatness, squareness, straightness, parallelism, overall quality and workmanship also make them ideal bases for mounting sophisticated mechanical, electronic and optical gauging systems. The size and capability of our factory allows us to producte any specification accroding to customers' requirement. Our standards mainly according to GB87-85, GGG-P-4630, DIN876, JIS-B510, ISO-DP8512 and so on. This item are available in grades"00" and"0", Manufactured from carefully selected black granite.At the same time, frame type stand and/or jack provided at extra price.