Material: Granite mainly consists of pyroxene,pkaguickase,a small amount of olivine ,biotite and micromagetite.Its structure is hard and compact.It has solidified in a natural way over millions of year resulting in his hogeneity ,reliable stability,high strength and super hardness .It can keep relatively high precision under heave load.It’s suitable for measuring applications in factories and laboratories. Applications:They are precision lapped to achieve desired accuracy. contact person:Sophia Han tel:86-0317-4505966