FP2549 - Key locking closed shackle Application Green stripes indicate Security Grade 3 to BS EN 12320. Specification Padlock body of extruded brass, black chrome plated.Shackle of rustproofed hardened steel, 8mm or 10mm diameter.Drainage holes in the padlock body prevent freezing. No external screws or rivets.Tensile strength over 1½ tons. Finish Standards Downloads FP2549 - Key locking closed shackle (.pdf, 52 kB) Close FP2541 - Key lockingGreen stripes indicate Security Grade 3 to BS EN 12320. FP2540 - Snap lockingGreen stripes indicate Security Grade 3 to BS EN 12320. FP2543 - Key locking extended shackleGreen stripes indicate Security Grade 3 to BS EN 12320.