This hardened steel chain with D Lock is accredited Sold Secure Bicycle Silver.The Master Lock No. 8234EURDPRO Chain with Mini D Lock is 90cm long and features 10mm diameter hardened steel links, offering resistance to cutting and sawing. The nylon sleeve provides additional protection for equipment. The mini U lock features a hardened steel body for maximum strength and reliability. The 14mm diameter shackle is made of hardened steel for maximum resistance to cutting and sawing. The high security disc cylinder prevents picking and the dual locking levers provide resistance against prying and hammering. The lock protection offers a weather proof. The bike lock is certified : Sold Secure Silver (UK) and Police Approved (UK). The Limited Lifetime Warranty provides peace of mind from a brand you can trust.