For maximum security, secure your bike with the Blackburn 9" U-lock featuring a 9 inch hardened steel shackle and a hardened steel crossbar with protective housing. Blackburn has all locks rated by a 3rd party testing facility for trusted, unbiased, and qualified security ratings. An independent lab has rated the security of this lock a maximum score of 5 on a 5-point scale. At a level 5 maximum security rating, the Blackburn® 9" U-lock comes with a $1000 anti-theft offer. The Blackburn 9" U-Lock includes two standard keys.. For every key lock, Blackburn® offers a free standard key replacement program. To redeem both offers, register online directly after your purchase by following the simple instructions included on packaging.