ABUS 83WP Extreme weatherproof closed shackle heavy-duty fully re-keyable through hardened steel alloy padlock, with a ball bearing locking mechanism for extra security, has a tough through hardened steel alloy shackle as standard with NANO PROTECT™ Chrome Plating. 6 pin tumbler cylinder rust free components with anti-pick mushroom pins, resists picking. Can be adjusted to operate key retaining or no key retaining, automatic locking or key to lock. Where to use: The 83 series range of padlocks offer a medium to high level of security, with the ability to offer various levels of security within one keying system and is suitable for internal or external use. NANO PROTECT™ Chrome Plating, Hardened steel & through hardened steel alloy shackles get the most effective protection available, where smallest nano particles close the smallest gaps found in the normal chrome plating \'making rusty shackles a thing of the past\' 1,000 hours salt bath test, the equivalent of 40 years in a harsh environment proves the durability of the NANO PROTECT™ process.