Squire Stronghold® P5 Padlock. The Stronghold P5 padlock is built for high security protection and offers excellent value for money. They meet the European CEN Grade 3 for padlocks. Features and Benefits. 50mm Hardened steel body Rekeyable 10mm Baron alloy shackle Hardened boron alloy steel shackle Electrophoretic finish - excellent corrosion resistance Gate lock ups, Warehouses, Garages etc.