The Blackburn Local U-Lock uses a twist proof, 10mm steel hexagonal shackle design that essentially doubles the resistance to cutting of a traditional lock. The shackle is also covered in a silicone sheath so it won’t damage or scratch your bike frame when in use. Blackburn generously provides three keys with each U-Lock, so you don’t need to panic if you misplace or lose one. Whether commuting or recreational riding, this U-Lock will give you the peace of mind to safely step away from your bike knowing it is well protected. The Local U-Lock is available in three sizes to best fit your bike: Compact 108mm x 162mm, Standard 108mm x 196mm, and Long 108mm x 230mm.