The 2m oxford nemesis padlock and chain combination offers the ultimate in strength and security the padlock has a 16mm hardened steel shackle with an anti pick double locking mechanism and may also be used as a disc lock the chain is constructed with huge 16mm cromo hardened steel links and a fabric covering with a reflective section for visibility sold secure is an independent non profit making organisation dedicated to reducing the risk of theft by testing security products the same me