This ultra strong padlock is designed for use with the Monster XL ultra strong security chains in mind, however is can be used with other chains and fixings to provide a high level of security, ideal for securing motorcycles, bicycles and more. Manufactured from hardened boron steel and featuring a 16mm shackle, this padlock is designed to keep even the most persistent thieves at bay and is Oxford attack tested for added piece of mind. Sold Secure is an independent, non-profit making organisation dedicated to reducing the risk of theft by testing security products. The same methods of attack used by criminals on the street are replicated by Sold Secure in the assessment of security products. Many insurance companies offer substantial reductions to those who use SOLD SECURE APPROVED PRODUCTS.