Marked both sides & both edges. Graduated to 1/16ths both edges. 16 stud centers marked in red. Regular outside markings. Has inside markings. ///brand_for_product_detail=Lufkin,close_out=No,companydescription=Lufkin - Made in mexico,condition=New,condition_google=new,cost=12.790000,countrymade=Made in mexico,country_flag=no_selection,featured=0,flag=no_selection,identifier_exists=0,instock=in stock,madeby=No,manufacture_country=Mexico,product_image_size=Default,product_page_type=Default,shopping_ad_bestseller=No,smart_campaign_bestsellers=Smart Campaign Bestsellers,square_product_image=https://square-production.s3.amazonaws.com/files/7c6987ab493d6a34f199f7eb5ba7fde201f4db58/original.jpeg,square_updated_at=0,sw_featured=No,sync_update_msg=Modified in Magento by harryepstein on 01/02/2016,url_path=6-ft-red-end-inside-reading-folding-rule