18" Machinist's Solid Square. Tolerance marked on square up to .006. - 18" Machinist's Solid Square///brand_for_product_detail=Acme,close_out=Yes,companydescription=Acme - Made in India,condition=New,condition_google=new,cost=12.690000,countrymade=Made in India,country_flag=no_selection,featured=0,flag=no_selection,identifier_exists=0,ins