CEN Grade 3 to 6 padlocks in open and closed shackle options. Mul-T-Lock’s NE Padlock is designed to withstand aggressive access attempts and extreme weather conditions - just what padlock is meant to do. In addition to Mul-T-Lock’s pick and drill resistant patented high precision pin tumbler system and case hardened solid steel bodies, the NE Padlock also features boron alloy hardened steel shackles for maximum protection against cut and saw attempts and black electrophoretic and hexavalent chromium plating for corrosion protection.