Made from high quality tool steel. True right angles inside and out. Beams and blades are precision ground and hardened. Length of blade is measured from inner edge of beam to end of blade. – 4″ PEC Solid Machinist Square///brand_for_product_detail=Products Engineering,close_out=No,companydescription=Products Engineering – Made in India,condition=New,condition_google=new,cost=14.130000,countrymade=Made in India,featured=0,identifier_exists=0,instock=in stock,manufacture_country=India,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/65abd38525bb1ccd97ec2a37cf1d678c57ced503/original.jpeg,square_updated_at=0,sw_featured=No,url_path=4-pec-solid-machinist-square