Cast iron square tube, granite V-block, the word foot

Cast iron cylinder: Press JB / T34.56-99 standards for manufacturing, material HT200, for parts parallelism, verticality inspection and marking. Cast iron cylinder Specifications: Complete specifications, customers can also request the production according to the drawings. Packing: wooden packing cast iron square tube: is used to test the mechanical manufacture or repair of machinery and other pieces are not parallel, not perpendicular to the necessary tools and a scribe, and precision into 0,1,2,3 general level 0 1,2 stage to test with, is crossed by three.