Applications:Widely used for checking straightness and marking purposes.Granite Straight Edges are hand scrapped or lapped to achieve the desired accurace as per standards. Salient Features: 1 Millions of natural aging, organiazational structure ,tiny linear expansion cosfficient and no stress make the precision super 2 Super rigidity, high hardness and great resistance-wear 3 Do’t oiling ,longusing life and easy maintainability 4 Keep datum precision in normal tempreture. 5 No magnetized,no sluggishness,and not be effected by enviroment. contact person :Sophia Han tel:86-0317-4505966