Really strong! The Strongman is a padlock with a massive shackle made of hardened 13 mm thick steel. The seamless transitions between the shackle and the lock body give it a solid, one-piece appearance. The UV-resistant silicone coating protects the bike frame. Another outstanding security feature is the disc cylinder lock, which offers excellent protection and safety. The package includes three high-security keys coated in silicone, along with a key card. The keys come with a matching colored wristband. With the Knog Strongman, performance is not the only priority; perfect style matters too. For this reason, the included frame holder has also been designed to match the overall color scheme.