Blackburn Sing Sing U-Lock

- Hexagonal 14mm alloy steel shackle with anti-scratch liner
- Maximum resistance to cutting and leverage attacks
- 12 tons of cut-strength
- Dual-bolt lock mechanism engages both shackle ends
- Lock mechanism is impervious to bump keys and picks
- Three laser-cut keys with key replacement program
- Mounting bracket included
- $2500 Theft replacement guarantee (Offer is only eligible in the USA)
- Size: 159mm x 76mm
- Security Rating: 10