4″ wide, replaceable, very hard PEEK Scrapers. Excellent for removal for RTV, sealant, adhesives and non-skid tape from aircraft cargo bay floors. Will not damage alodine primer and metal or composite substrates. These PEEK scrapers are for exterior surfaces. They are also listed and approved by AIRBUS, CESSNA, EMBRAER, LOCKHEED-MARTIN, USAF, US NAVY, US ARMY, US MARINE CORPS, etc.