The K-Traz F16L uses U-Locking security features, coupled with the practicality of a wind-up cable. It has a high level of tensile and torsional strength, making it highly resistant against theft and drilling. It features the Z-Safe locking mechanism which is a powerful double locking system, making the lock highly resistant against impacts and twists. 
Features

Easy to carry: Folding design makes easy storage in it's cover, which can be attached to bottle cage mountings or by straps
High resistance: Tensile and torsion strength. Antitheft and antidrilling
Long length: 95cm unfolded
Loss of key service: Duplication of keys in case of loss. Unique serial number

Specifications

Level Of Security: 16 - For areas with a moderate risk of theft 
Compact: Easy To Carry
Quick Mounting: Mounting Clip
3 Keys included
Loss of key service
Material: Steel Plates
Weight: 1343g
Cable Length 95cm / 37.4"