Granite surface plate isbase on the quality of underground rock, after one hundred      million years of natural aging,form isstable.Wear resistance, acid resistance, alkali resistance,    high corrosion resistance, never rust.Granite surface plate precision is very good..

Granite surface plate ismade of high quality natural marble stone after machining,lapping by hand andbecome.Black luster, precision uniform texture, good stability.Strength andhigh hardness.

Granite surface plate ismade of natural stone material precision measuring tools,the instruments andmeters, precision instruments, mechanical parts inspection, all is theideal       datum.