Cast iron plates, cast iron platforms, inspection plates, inspection platforms, scribing plates, and scribing platforms are generally cast from cast iron and manually scraped and chiseled. Their accuracy is classified into Grade 0, Grade 1, Grade 2, and Grade 3. Typically, Grade 0, Grade 1, and Grade 2 are used for inspection purposes, while Grade 3 is used for scribing. The standard specifications range from 100*100 mm to 3000*8000 mm. For sizes larger than these, splicing can be employed.