Granite square is a kind of professional measuring tool, called square ruler for short. On some occasions, it is also called a learning ruler. It is used to detect the perpendicularity of the workpiece and the perpendicularity of the relative position of the workpiece, and sometimes it is used for lineation.
> Compression strength：245-254kg/mm2
> Flexible grinding capacity：1.27-1.47N/mm2
> Coefficient of linear expansion：4.6×1－6℃
> Water absorption 0.13%
> Shore hardness HS: more than 70。
> Precision has 000. 00, 0, 1 grade.
> Material: Granite
Our products are widely exported to Australia, New Zealand, Vietnam, Thailand, South Korea and England, Germany, and so on.
PS: We also can produce as customers' requests or drawings.